myra's stamp collection consisted of 120 stamps in october. By the following march, her collection had grown to 138 stamps. By how much did her collection increase between october and march

Answers

Answer 1

Answer:

18 stamp increase

15 % increase

Step-by-step explanation:

To find the increase in number , we take the number of stamps in march and subtract the stamps in october

128-120 = 18

To find the percent increase, we take the number of stamps that we gained over the original amount of stamps * 100%

percent increase = 18/120 * 100%

                              .15 * 100%

                              15% increase

Answer 2

Myra's stamp collection increased by 18 stamps from October to the following March. This is calculated by subtracting the number of stamps she had in October (120 stamps) from the number she had in March (138 stamps).

To find out by how much Myra's stamp collection has increased between October and March, you simply need to subtract the number of stamps she had in October from the number she had in March. She had 120 stamps in October, and by March, she had 138 stamps.

To calculate the increase, we'll use the following steps:

Take the number of stamps in March: 138 stamps.Subtract the number of stamps she had in October: 120 stamps.The difference will give us the increased number of stamps.

Doing the math:

138 stamps (in March) - 120 stamps (in October) = 18 stamps

So, Myra's collection increased by 18 stamps between October and March.


Related Questions

A man wishes to have a rectangular shaped garden in his backyard. He has 84 feet of fencing with which to enclose his garden. a) Write an expression for the perimeter of the garden. b) The area of the garden is A = l*w. Use the perimeter equation from part (a) to write the area in terms of just one variable. c) Find the dimensions for the largest area garden he can have if he uses all the fencing.

Answers

Answer:

84=2l+2w

w=21

Step-by-step explanation:

84=2(l+w)

42=l+w

l=42-w

Area=l×w

A=(42-w)×w

Differentiate A=42w-w×w

with respective to "w".

dA/dw= 42-2w

For a minimum or maximum area

dA/dw=0

then, 42-2w=0

w=21

proving "A" is maximum when "w=21"

dA/dw>0 when w<21

dA/dw<0 when w>21

Therefore Area is maximum when "w=21"

Final answer:

The most extensive rectangular garden this man can build with his 84 feet of fencing would be a square with length and width of 21 feet each, yielding a total area of 441 square feet.

Explanation:

A rectangular garden's perimeter can be expressed as P = 2l + 2w, where l is the length and w is the park's width. Given 84 feet of fencing (the total perimeter), this equation becomes 84 = 2l + 2w. Simplified, this gives l + w = 42. Expressing w in terms of l gives w = 42 - l.

Next, breathing, we substitute w into the area formula A = l * w, get A = l * (42 - l). This area expression of one variable forms a quadratic equation, A = -l² + 42l. This suggests that the site is maximized from the quadratic formula when l = -b/2a = 42/2 = 21. So, the length and width of the most significant garden area are both 21 feet, representing a square.

Learn more about Maximizing Area here:

https://brainly.com/question/34713449

#SPJ3

Which describes the graph of f(x)=[x]-2 on [0,3)

50 points to you

Answers

Answer:

The first choice is the one you want

Step-by-step explanation:

First thing you need to know about this greatest integer graph is that it is aptly called a step graph.  It literally looks like stair steps on your calculator: short horizontal lines that are not connected vertically.  Really cool graph.

Second thing you need to know is about transformations of functions.  ANY side-to-side movement in ANY function will be in a set of parenthesis (or absolute value symbols, or under a radical sign, or inside the greatest integer brackets, etc.) and ANY up or down movement will be either added or subtracted.  Added means you move the function up from its starting position, subtracting means you move the function down from its starting position.  Since we have no numbers inside the greatest integer brackets, there is no side-to-side movement.  Since there is a "-2" after the brackets, we are moving the whole function down.

If you do not know how to graph these without a calculator and you have no idea what this graph looks like, I recommend going to your calculator to see it.  First, call up your "y = " window.  Next, hit 2nd-->0 (catalog), then hit the x^2 button (this will take you to the letter I in the catalog).  Scroll down til you see "int( " and hit that button.  It will take you back to the "y = " window.  Enter an x after that set of parenthesis and then close it, then hit " - 2 " and then "graph".  Your steps should begin to appear.  Notice that the horizontal line between x = 0 and x = 1 is at y = -2.  The parent graph has this line between x = 0 and x = 1 on y = 0.  The -2 in ours moved the graph down from y = 0 to y = -2

Summing up, the first choice is the one you want as your answer.

Answer:

A:

The steps are at y=-2

Step-by-step explanation:

edge 2021

Can someone help me with this math question

Answers

Answer:

(2, 1).

Step-by-step explanation:

Dilated by factor 3:

C = (6, 3) ----> C' would be (6 * 1/3, 3 *1.3) = (2, 1).

For a binomial distribution with a sample size equal to 10 and a probability of a success equal to​ 0.30, what is the probability that the sample will contain exactly three​ successes? Use the binomial formula to determine the probability. Round to four decimal places.

Answers

Answer:

The probability that the sample will contain exactly three​ successes is 0.2668.

Step-by-step explanation:

Given information:

Sample size = 10

Probability of a success, p=0.30

Probability of a failure q=1-p = 1-0.30 = 0.70

The binomial formula to determine the probability is

[tex]P(X=r)=^nC_rp^rq^{n-r}[/tex]

where, n is the sample size, r is required number of success, p is probability of success and q is probability of failure.

We need to find the probability that the sample will contain exactly three​ successes.

[tex]P(X=3)=^{10}C_3(0.30)^3(0.70)^{10-3}[/tex]

[tex]P(X=3)=^{10}C_3(0.30)^3(0.70)^{7}[/tex]

[tex]P(X=3)=(120)(0.0022235661)[/tex]

[tex]P(X=3)=0.266827932[/tex]

[tex]P(X=3)\approx 0.2668[/tex]

Therefore the probability that the sample will contain exactly three​ successes is 0.2668.

Using the binomial distribution, it is found that there is a 0.2668 = 26.68% probability that the sample will contain exactly three​ successes.

What is the binomial distribution formula?

The formula is:

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]

The parameters are:

x is the number of successes.n is the number of trials.p is the probability of a success on a single trial.

In this problem:

The sample size is of n = 10.The probability of a success is of p = 0.3.

The probability that the sample will contain exactly three​ successes is P(X = 3), hence:

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

[tex]P(X = x) = C_{10,3}.(0.3)^{3}.(0.7)^{7} = 0.2668[/tex]

More can be learned about the binomial distribution at https://brainly.com/question/24863377

use the point slope formula to find the line perpendicular to y=-2x+9 passing through points (1,7)

Answers

Answer:

y-7 = 1/2(x-1) point slope form

y = 1/2x+13/2  slope intercept form

Step-by-step explanation:

y=-2x+9

This equation is in the form y= mx +b so the slope is -2

We want a line perpendicular

Take the negative reciprocal

m perpendicular is - (-1/2)

m perpendicular = 1/2

We have a slope of 1/2 and a point.  We can use point slope form

y-y1 = m(x-x1)

y-7 = 1/2(x-1)  point slope form

y-7 = 1/2x-1/2

Adding 7 to each side

y-7+7 =1/2x -1/2+7

y = 1/2x-1/2 +14/2

y = 1/2x +13/2  slope intercept form

WILL MARK BRAINLIEST!!
Find the distance between
the pair of parallel lines.
y = 2x + 4
y = 2x - 4

A) 4.01
B) 3.84
C) 3.58
D) 3.65

Answers

Answer:

3.58

Step-by-step explanation:

Given :

y = 2x + 4 -------- eq1

y = 2x - 4 -------- eq2

sanity check : both equations have same slope, so we can conclude that they are both parallel to one another.

Step 1: consider equation 1, pick any random x-value and find they corresponding y-value. we pick x = -2

This gives us y = 2(-2) + 4 = 0

Hence we get a point (x,y) = (-2,0)

Step 2: express equation 2 in general form (i.e Ax + By + C = 0)

y = 2x-4 -------rearrange---> 2x - y -4 = 0

Comparing with the general form, we get A = 2, B = -1, C = -4

Recall that the distance between 2 parallel lines is given by the attached formula (see attached picture).

substituting the values for A, B, C and (x, y) from the previous step:

d = | (2)(-2) + (-1)(0) + (-4) |  / √(2² + (-1)²)

d = | -4 + 0 - 4 |  / √(4 + 1)

d = | -8 |  / √5

d = 8  / √5

d = 3.5777

d = 3.58 (rounded 2 dec. pl)

I need help with this problem. This is confusing with this formula.


Answers

Answer:

  v = 40 . . . ft/sec

Step-by-step explanation:

Put the value 25 where h is in the formula and do the arithmetic.

  V = √(64·25) = (√64)(√25) = 8·5

  V = 40 . . . . feet per second

Seven nouns, five verbs, and two adjectives are written on a blackboard. How many ways are there to form a sentence by choosing one word of each type?

Answers

Answer:

70 sentences

Step-by-step explanation:

7 x 5 x 2= 70

Select the graph that shows the solution set for the following system.
x + y < 2
x>2

Answers

Answer:

Answer is in the attachment.

Step-by-step explanation:

To graph x>2 consider first x=2. x=2 is a vertical line and if you want to graph x>2 you need to shade to the right of the vertical line.

To graph x+y<2, I will solve for y first.

x+y<2

Subtract x on both sides:

  y<-x+2

Consider the equation y=-x+2.  This is an equation with y-intercept 2 and slope -1 or -1/1.  So the line you have in that picture looks good for y=-x+2. Now going back to consider y<-x+2 means we want to shade below the line because we had y<.

Now where you see both shadings will be intersection of the shadings and will actually by your answer to system of inequalities you have.  In my picture it is where you have both blue and pink.

I have a graph in the picture that shows the solution.

Also both of your lines will be solid because your question in the picture shows they both have equal signs along with those inequality signs.

Just in case my one graph was confusing, I put a second attachment with just the solution to the system.

Correlation is a measure of the extent to which two factors are _______

Answers

Answer:

related

Explanation:

Correlation is a numerical value that tells how two variables or factors change together.

The correlation between two factors may be positive, negative or nonexistent.

A strong association is shown when the graph of the points representing the factors are reasonably well represented by a line.

A perfect positive correlation is when the two variables are related by a linear function with positive slope (the two factors grow together).

A perfect negative correlation exists when the two factors are related by a linear function with negative slope (one factor grows when the other factor decreases).

A nonexistent correlation is when the two factors are not related in any way to each other and so none function can be obtained.

Final answer:

Correlation measures how two variables are related, with the correlation coefficient indicating the strength and direction of this relationship. The coefficient ranges from -1 to +1, where +1 is a perfect positive correlation and -1 is a perfect negative correlation.

Explanation:

Correlation is a measure of the extent to which two factors are related. Specifically, it refers to how one variable changes in relation to another. The statistical measure used to describe this is called a correlation coefficient, represented by the letter r.

The value of r ranges from -1 to +1, where +1 signifies a perfect positive correlation, -1 signifies a perfect negative correlation, and 0 indicates no correlation at all.

Positive correlation happens when both variables change in the same direction, either increasing or decreasing together. Conversely, a negative correlation indicates that as one variable increases, the other decreases.

While correlation is a useful statistical tool to identify a relationship between two variables, it is crucial to understand that correlation does not imply causation.

This means that just because two variables are correlated, it does not necessarily mean that one variable causes the other to change.

Water from a hose is sprayed on a fire burning at a height of 10 m up the side of a wall. If the function h(x) = -0.15t^2 + 3x, where x is the horizontal distance from the fire, in metres, models the height of the water, h(x), also in metres. How far back does the firefighter have to stand in order to put out the fire?

PLEASE ANSWER ASAP WILL GIVE BRAINLIEST

Answers

Answer:

  4.2 or 15.8 metres

Step-by-step explanation:

We assume your model for the height of the water stream is supposed to be ...

  h(x) = -0.15x^2 +3x

This will have a value of 10 when ...

  -0.15x^2 +3x = 10

  .15x^2 -3x +10 = 0 . . . . . subtract the left side to get standard form

For a quadratic equation of the form ...

  ax² +bx +c = 0

The solutions are given by the "quadratic formula:"

[tex]x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex]

The above equation matches the template with a=0.15, b=-3, c=10. Putting these values into the formula gives ...

[tex]x=\dfrac{-(-3)\pm\sqrt{(-3)^2-4\cdot 0.15\cdot 10}}{2\cdot 0.15}=\dfrac{3\pm\sqrt{3}}{0.3}\\\\x=10\pm\dfrac{10}{3}\sqrt{3}[/tex]

  x ≈ 4.2 or 15.8

The firefighter can stand at 4.2 metres or 15.8 metres from the fire to get the water to arrive at the building 10 metres up.

The price of a pair of shoes is $52. This price is 15% lower than last week. What was the price of the shoes last week? Round your answer to the nearest cent

Answers

Answer:

$61.18

Step-by-step explanation:

The price last week was an unknown. We will call it x. x is an entire amount, so it is 100% of x.

This week, the price is 15% lower. Since 100% - 15% = 85%, the price this week is 85% of what it was last week. Last week it was x, so this week, the price is 85% of x.

85% of x = $52

0.85x = $52

Divide both sides by 0.85:

0.85x/0.85 = $52/0.85

x = $61.1764...

Answer: $61.18

Final answer:

To determine the original price of the shoes before a 15% discount, divide the discounted price, $52, by 0.85. The original price of the shoes was approximately $61.18.

Explanation:

The question asks to find the original price of the shoes before they were discounted by 15%. To find the original price, you can use the formula for calculating the original price after a discount has been applied. If the current price represents 85% (100% - 15%) of the original price, you can set up the equation as follows: $52 = 85% of the original price.

To find the original price, divide the current price by 85% (or 0.85 in decimal form): Original Price = $52 ÷ 0.85. This calculation gives an original price of approximately $61.18, rounding to the nearest cent.

PLEASE HELP ME FIND THE LENGTH

Answers

Answer:

Length of arc AB= 2πr (angle) /360

= 2π×6× 30°/360

= π.

ANSWER

The length of arc AB is π units.

EXPLANATION

The length of an arc of a circle is calculated using the formula:

[tex]l = \frac{ \theta}{360} \times 2\pi \: r[/tex]

Where [tex] \theta = 30 \degree[/tex]

is the angle of sector and r=6 units is the radius of the circle.

We substitute these values into the formula to find the length of arc AB.

[tex]l = \frac{30}{360} \times 2 \times \pi \: \times 6[/tex]

[tex]l = \pi[/tex]

The length of the arc is π units.

So put 1 as the coefficient.

Which is the best approximation to a solution of the equation e x = 2x + 3?

0
1
2
3

Answers

The answer for 2x+3 is 3

Answer:

Step-by-step explanation:

Given that an equation in variable x as follows:

[tex]e^x =2x+3[/tex]

Let us start with x=0

We have left side = 1 and right side = 3.

Error = 2

ii) x=1: left side = e =2.718 and right side = 6.

Error = 3.282

iii) x =2: Left side = 7.388 and right side = 7

Error = 0.388

iv) x=3

Left side = 20.079

Right side = 9

Error = 11.079

Since error is the least when x=0, we can say 0 is the best approximation.

A walking path across a park is represented by the equation y= -3x - 6 . A new path will be built perpendicular to this path. The path will intersect at the point (-3 , 3) . Identify the equation that represents the new path . WILL MARK BRAINIEST!

Answers

Answer:

The equation that represents the new path is y=(1/3)x+4

Step-by-step explanation:

step 1

Find the slope of the give line

we have

y=-3x-6

so

the slope m is equal to

m=-3

step 2

Find the slope of the perpendicular line to the given line

Remember that

If two lines are perpendicular, then their slopes are opposite reciprocal of each other

so

we have

m=-3 -----> slope of the given line

therefore

The slope of the perpendicular line is equal to

m=1/3

step 3

With m=1/3 and the point (-3,3) find the equation of the line

y-y1=m(x-x1)

substitute

y-3=(1/3)(x+3)

y=(1/3)x+1+3

y=(1/3)x+4 -----> equation that represent the new path

PLEASE HELP ASAP! I don’t recall how to do this!

Answers

Answer:

Step-by-step explanation:

For a. we start by dividing both sides by 200:

[tex](1.05)^x=1.885[/tex]

In order to solve for x, we have to get it out from its position of an exponent.  Do that by taking the natural log of both sides:

[tex]ln(1.05)^x=ln(1.885)[/tex]

Applying the power rule for logs lets us now bring down the x in front of the ln:

x * ln(1.05) = ln(1.885)

Now we can divide both sides by ln(1.05) to solve for x:

[tex]x=\frac{ln(1.885)}{ln(1.05)}[/tex]

Do this on your calculator to find that

x = 12.99294297

For b. we will first apply the rule for "undoing" the addition of logs by multipllying:

[tex]ln(x*x^2)=5[/tex]

Simplifying gives you

[tex]ln(x^3)=5[/tex]

Applying the power rule allows us to bring down the 3 in front of the ln:

3 * ln(x) = 5

Now we can divide both sides by 3 to get

[tex]ln(x)=\frac{5}{3}[/tex]

Take the inverse ln by raising each side to e:

[tex]e^{ln(x)}=e^{\frac{5}{3}}[/tex]

The "e" and the ln on the left undo each other, leaving you with just x; and raising e to the power or 5/3 gives you that

x = 5.29449005

For c. begin by dividing both sides by 20 to get:

[tex]\frac{1}{2}=e^{.1x}[/tex]

"Undo" that e by taking the ln of both sides:

[tex]ln(.5)=ln(e^{.1x})[/tex]

When the ln and the e undo each other on the right you're left with just .1x; on the left we have, from our calculators:

-.6931471806 = .1x

x = -6.931471806

Question d. is a bit more complicated than the others.  Begin by turning the base of 4 into a base of 2 so they are "like" in a sense:

[tex](2^2)^x-6(2)^x=-8[/tex]

Now we will bring over the -8 by adding:

[tex](2^2)^x-6(2)^x+8=0[/tex]

We can turn this into a quadratic of sorts and factor it, but we have to use a u substitution.  Let's let [tex]u=2^x[/tex]

When we do that, we can rewrite the polynomial as

[tex]u^2-6u+8=0[/tex]

This factors very nicely into u = 4 and u = 2

But don't forget the substitution that we made earlier to make this easy to factor.  Now we have to put it back in:

[tex]2^x=4,2^x=2[/tex]

For the first solution, we will change the base of 4 into a 2 again like we did in the beginning:

[tex]2^2=2^x[/tex]

Now that the bases are the same, we can say that

x = 2

For the second solution, we will raise the 2 on the right to a power of 1 to get:

[tex]2^x=2^1[/tex]

Now that the bases are the same, we can say that

x = 1

This question is "Decompose figures to find volume"

This question that im struggling with is really kinda hard for me....​

Answers

See how it is made of two shapes? One shape is 2x9x5 in and the other is 8x9x1. Add the two products. 2x9x5=90 and 8x9x1=72. 90+72=162 and that's the answer

Answer : The total volume of figure is, [tex]162in^3[/tex]

Step-by-step explanation :

First we have to calculate the volume of cuboid A.

[tex]V_A=l\times b\times h[/tex]

where,

[tex]V_A[/tex] = volume of cuboid A

l = length of cuboid = 9 in

b = breadth of cuboid = 5 in

h = height of cuboid = 2 in

[tex]V_A=9in\times 5in\times 2in[/tex]

[tex]V_A=90in^3[/tex]

Now we have to calculate the volume of cuboid B.

[tex]V_B=l\times b\times h[/tex]

where,

[tex]V_B[/tex] = volume of cuboid B

l = length of cuboid = 9 in

b = breadth of cuboid = 1 in

h = height of cuboid = 2 in

[tex]V_B=9in\times 1in\times 2in[/tex]

[tex]V_B=18in^3[/tex]

Now we have to calculate the volume of cuboid C.

[tex]V_C=l\times b\times h[/tex]

where,

[tex]V_C[/tex] = volume of cuboid C

l = length of cuboid = 9 in

b = breadth of cuboid = 1 in

h = height of cuboid = (8-2=6) in

[tex]V_C=9in\times 1in\times 6in[/tex]

[tex]V_C=54in^3[/tex]

Now we have to calculate the total volume of figure.

Total volume of figure = [tex]V_A+V_B+V_C[/tex]

Total volume of figure = [tex]90in^3+18in^3+54in^3[/tex]

Total volume of figure = [tex]162in^3[/tex]

Thus, the total volume of figure is, [tex]162in^3[/tex]

Find the distance between the points (-3, -2) and (-1, -2).

Answers

The distance is,

[tex]d(A,B)=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]

Where [tex]A(x_1,y_1),B(x_2,y_2)\longrightarrow A(-3,-2),B(-1,-2)[/tex]

[tex]d(A,B)=\sqrt{(-1-(-3))^2+(-2-(-2))^2}=\sqrt{4}=2[/tex]

The distance between points A, B is 2 units.

Hope this helps.

r3t40

The formula for distance between two points is:

[tex]\sqrt{(x_{2} -x_{1})^{2} + (y_{2} -y_{1})^{2}}[/tex]

In this case:

[tex]x_{2} =-1\\x_{1} =-3\\y_{2} =-2\\y_{1} =-2[/tex]

^^^Plug these numbers into the formula for distance like so...

[tex]\sqrt{(-1 - (-3))^{2} + (-2 - (-2))^{2}}[/tex]

To solve this you must use the rules of PEMDAS (Parentheses, Exponent, Multiplication, Division, Addition, Subtraction)

First we have parentheses. Remember that when solving you must go from left to right

[tex]\sqrt{(-1 - (-3))^{2} + (-2 - (-2))^{2}}[/tex]

-1 - (-3) = 2

[tex]\sqrt{(2)^{2} + (-2 - (-2))^{2}}[/tex]

-2 - (-2) = 0

[tex]\sqrt{(2)^{2} + (0)^{2}}[/tex]

Next solve the exponent. Again, you must do this from left to right

[tex]\sqrt{(2)^{2} + (0)^{2}}[/tex]

2² = 4

[tex]\sqrt{4 + (0)^{2}}[/tex]

0² = 0

[tex]\sqrt{(4+0)}[/tex]

Now for the addition

[tex]\sqrt{(4 + 0)}[/tex]

4 + 0 = 4

√4 <<<This can be further simplified to...

2

***Remember that the above answers are in terms of units

Hope this helped!

~Just a girl in love with Shawn Mendes

WORTH 10 POINTS!!! NEED HELP ASAP

How will the graph of log x compare to the graph of ln x?

Answers

For this case we have to graph, we can see in the figure that the graph of the Neperian logarithm grows faster than the graph of the logarithm.

The graph of ln (x) is the second attached

Answer:

Option A

The log (x) graph will grow slower than the ln (x) graph.

See attached image

HELLP!!
PART C
How does each conic surface inside the telescope affect the path of light?

Answers

Explanation:

The point of a reflecting telescope is to reflect the light toward the eyepiece. That's what each reflecting surface does. By arranging the locations of the foci in the manner described, the light path is made to go from one focus to another, and finally to the focus at the eyepiece location.

Each conic surface is a reflecting surface that reflects the light closer to the eyepiece.

Answer:

Inside a telescope, the parabolic mirror reflects parallel light rays entering the telescope to its focus, which is also the focus of the hyperbolic mirror. The hyperbolic mirror then reflects those light rays to its other focus, where the image is observed.

Step-by-step explanation:

The two roots a+sqrb and a-sqr b are called _______radicals.

Answers

Answer:

Conjugate radicals.

Step-by-step explanation:

The two roots a+sqrb and a-sqr b are called conjugate radicals.

BRAINLIEST WILL BE GIVEN

Answers

Answer: 45 degree angle

On a multiple-choice quiz, a correct answer is awarded 4 points, but an incorrect answer costs the student 1 point. Suppose each question on the quiz has 4 choices and no question has multiple correct answers. If a student were to guess on every question, what is the number of points the student should expect to get per question?

Answers

Answer:

Hence, the answer is:

                [tex]\dfrac{1}{4}[/tex]

Step-by-step explanation:

It is given that:

A correct answer is awarded 4 points, but an incorrect answer costs the student 1 point.

This means that the point +4 is added if the answer is correct.

and -1 will be added if the answer is incorrect.

Also, the probability of getting a correct answer is: 1/4

( since out of 4 choices only one option is correct)

and the probability of getting a incorrect answer is: 3/4

( since out of 4 choices 3 are incorrect)

Hence, the expected point the student should expect to get per question is:

[tex]E(X)=\dfrac{1}{4}\times (+4)+\dfrac{3}{4}\times (-1)\\\\i.e.\\\\E(X)=1-\dfrac{3}{4}\\\\i.e.\\\\E(X)=\dfrac{1\times 4-3}{4}\\\\i.e.\\\\E(X)=\dfrac{4-3}{4}\\\\i.e.\\\\E(X)=\dfrac{1}{4}[/tex]

Final answer:

A student who guesses on a multiple-choice question with four options should expect to earn an average of 0.25 points per question due to the probabilities of correct and incorrect answers and their respective points.

Explanation:

When guessing on a multiple-choice question with four possible answers, the probability of a correct guess is 1/4, while the probability of an incorrect guess is 3/4. The expected points per question is calculated by multiplying the probability of each outcome by the points awarded or deducted for that outcome and summing these products. With 4 points for a correct answer and a loss of 1 point for an incorrect answer, the calculation is as follows:

(1/4) × 4 points + (3/4) × (-1 point) = 1 point - 3/4 points = 1/4 points

Therefore, the student should expect to earn 0.25 points per question on average if they were to guess on each question.

Renee is simplifying the expression (7) (13/29) (1/7).She recognizes that 7 and 1/7 are reciprocals, so she would like to find their product before she multiplies by 13/29. Which property will allow Renee to do this without changing the value of the expression

Answers

Answer:

There's one important property which states that when a number is multiplied by its reciprocal, equals 1.

The commutative property of multiplication states that two or more numbers can be multiplied in any order, therefore, the expression:  (7)×(13/29)×(1/7) can be changed to  (7)×(1/7)×(13/29) and the result won't be altered.

Now, given that 7 and 1/7 are reciprocals, the result is 1. Therefore, the result of the multiplication equals (13/29)

Answer:

communitive property

Step-by-step explanation:

In Janie’s homeroom, 45% of the students’ families own a dog and 23% own a dog and a cat. What is the probability that a student’s family owns a cat if the family owns a dog?

Answers

Answer:

51,111%

Step-by-step explanation:

We know that 45% have a dog but no cat.  While 23% have both a dog and a cat.

Then Pr(X has cat|X has dog) = Pr(X has dog and cat)/Pr(X has dog)

= Pr(X has dog and cat)/Pr(X has dog) = 0.23/0.45 = 0.51 ≈ 51,111%

The probability that a student’s family owns a cat if the family owns a dog is 51,111%

Answer:

51.1% is the correct answer.

Step-by-step explanation:

2. Determine the slope of the following equation: x - 2y = 3
A. 1/2
B. 1
C. -1
D. -1/2

Answers

Answer:

A 1/2

Step-by-step explanation:

x - 2y = 3

-2y = -x + 3

y = 1/2 x - 3/2

please mark brainliest :)

Answer:

A.  1/2

Step-by-step explanation:

Solve the equation for y.

x - 2y = 3

Subtract x from both sides.

-2y = -x + 3

Divide both sides by -2.

[tex] y = \dfrac{1}{2}x - \dfrac{3}{2} [/tex]

The slope-intercept equation of a line is y = mx + b, where m is the slope.

In the case, m = 1/2.

Answer: slope = 1/2

A rhombus ????? a quadrilateral.

Need help on this​

Answers

Answer:

Is always a quadrilateral.

Is a parelleogram.

Answer:

  "is always"

Step-by-step explanation:

A rhombus is a 4-sided polygon that has all sides equal lengths. It is a quadrilateral and a parallelogram. A square is a special case of a rhombus.

in the figure below, find the exact value of z. (do not approximate your answer)

Answers

Answer:

  √35

Step-by-step explanation:

The right triangles are all similar, so the ratios of long leg to hypotenuse are the same for all:

  z/7 = 5/z

  z² = 35 . . . . multiply by 7z

  z = √35

Answer:

√35

Step-by-step explanation:

The right triangles are all similar, so the ratios of long leg to hypotenuse are the same for all:

 z/7 = 5/z

 z² = 35 . . . . multiply by 7z

 z = √35

Plot A shows the number of hours ten girls watched television over a one-week period. Plot B shows the number of hours ten boys watched television over the same period of time.

Television Viewing Hours for a One-Week Period

Which statement compares the shape of the dot plots?
A) There is a gap in both plots.
B) There is a gap in Plot A, but not in Plot B.
C) The data is spread widely across both plots.
D) The data is spread widely across Plot B, but not across Plot A.

Answers

Answer:

B) There is a gap in Plot A, but not in Plot B.

Step-by-step explanation:

Plot A shows the number of hours ten girls watched television over a one-week period. Plot B shows the number of hours ten boys watched television over the same period of time. There is a gap in Plot A, but not in Plot B compares the shape of the dot plots.

The correct answer is B) There is a gap in Plot A, but not in Plot B

Explanation:

A dot plot is a type of graphic used in statistics to show information collected about a group of subjects or elements. In this, each dot or circle represents a subject related to a specific scale for example, in the case presented, the scale is the number of hours subjects watched television.

According to this, the statement that is true about the dot plots presented is that there is a gap in plot A because most subjects reported watching television for 3 to 7 hours; however, one of the subjects watched television 10 hours. This implies, a gap or space in the graphic because there is an interval in the scale with no subjects as most are grouped in a cluster except by one. This does not occur in plot B because all subjects form one cluster or group.

Sarah fenced in her backyard. The perimeter of the yard is s18 feet, and the width of the yard is 4 feet. Use the perimeter formula to find the lenght of the rectangular yard in inches: P = 2L + 2W

Answers

Answer:

  60 inches

Step-by-step explanation:

Put the given numbers in the formula and solve for the remaining unknown.

  P = 2L +2W

  18 ft = 2L +2×(4 ft)

  10 ft = 2L . . . . . . . . . subtract 8 ft

  5 ft = L . . . . . . . . . . . divide by 2

You want this in inches, so you make use of the fact that each foot is 12 inches.

  5 ft = 5×(12 in) = 60 in

The length of Sarah's fenced yard is 60 inches.

Answer:

60 IN

Step-by-step explanation:

DID THE QUIZ AND GOT IT CORRECT

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