4 middle school questions

Answer:

10 squared units

Step-by-step explanation:

This triangle is pretty easy since it creates a right triangle.  So the base length and height length are pretty easy to identify.

The area of a triangle is .5*base*height.

The base length after drawing the points is a horizontal so just count it or do 4-0=4.

The height length after drawing the points is a vertical so just count it or do 4-(-1)=4+1=5.

So the area of the triangle is .5*4*5=.5(20)=10 units squared.

Now if you didn't fill like drawing it and you knew how to find the determinant.

You just compute

.5 times det|  0   -1     1  |

                   |  0   4      1  |

                   |   4  -1      1  |

.5[  0 det| 4     1  |          -   -1 det|  0   1 |          +    1 det | 0   4 |      ]

              |  -1    1  |                        |  4   1 |                         |  4  -1 |

.5[ 0                           - -1(0-4)                      +   1(0-16)]

.5[  0                         -4                               -16]

.5[-20]

-10

And if you get a negative just take the absolute value of it giving you 10.  

Answer:

Attached

Step-by-step explanation:

The equation for the graph is

c(x)=3x+2

rewrite as

y=3x+2.............................................(1)

Then graph equation to visualize as attached.

Let the x-axis to represent minutes and the y-axis to represent cost

Answer:

The graph of required function is shown below.

Step-by-step explanation:

The given function is

[tex]c(x)=3x+2.00[/tex]

In this function c(x) is the cost for a taxi ride and x is the number of minutes.

It means, in the graph of cost function x-axis represents the time in minutes and y-axis represents the cost.

Time can not be negative. So, the function is defined for all non-negative values of x.

Table of values:

x            c(x)

0            2.00

1             5.00

2            8.00

3            11.00

Plot any two points from these points on a coordinate plane and connect them by  straight line.

Therefore, the graph of required function is shown below.

Answer:

Option A. 93.5°

Step-by-step explanation:

we know that

The measure of the inner angle is the semi-sum of the arcs comprising it and its opposite.

so

∠C=(1/2)[83°+2(52°)]

∠C=(1/2)[83°+104°]

∠C=(1/2)[187°]

∠C=93.5°

Answer:

22 cm, 24 cm, and 24 cm.

Step-by-step explanation:

Isosceles Triangle is a type of triangle in which two of the three sides are equal in length. The perimeter is 70 cm. Therefore, in this question, since the sides are unknown, we can assume that:

Length of the shorter side = x cm.

Length of the other sides = y cm.

The relationship between x and y is given by:

x = (2y - 26) cm (because it is mentioned that the shortest side is 26 cm less than twice as long as the other sides).

Perimeter of a triangle = sum of all sides.

Since its an isosceles triangle, therefore:

Perimeter of the triangle = x + 2y.

Substituting the values in the perimeter formula gives:

Perimeter of the triangle = 2y - 26 + 2y.

70 = 4y - 26.

4y = 96.

y = 24 cm.

Substituting y = 24 in the equation x = 2y - 26 gives x = 2(24) - 26 = 22 cm.

So in the ascending order, the lengths are 22 cm, 24 cm, and 24 cm!!!

Answer:

6

Step-by-step explanation:

Using the sine ratio in the right triangle

let x = hypotenuse and sin45° = [tex]\frac{\sqrt{2} }{2}[/tex], then

sin45° = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{3\sqrt{2} }{x}[/tex]

and

[tex]\frac{3\sqrt{2} }{x}[/tex] = [tex]\frac{\sqrt{2} }{2}[/tex] ( cross- multiply )

[tex]\sqrt{2}[/tex] × x = 6[tex]\sqrt{2}[/tex]

Divide both sides by [tex]\sqrt{2}[/tex]

x = 6

Answer:

-6 > x

Step-by-step explanation:

First, no matter which variable and coefficient you move, you will be dividing by a negative in the end, so reverse the inequality symbol when your answer is found. Next, you move whichever term [NOT associated with a variable (negative or positive)] is near the variable and coefficient over to the left or right side of the inequality symbol depending on where they are in the inequality. Finally, you divide by the negative coefficient it gives you, and you will arrive at your answer with your inequality symbol reversed. The answer just happens to be written in reverse. Although it is written in reverse, it is still the same answer.

I hope this helps you understand the concept, and as always, I am joyous to assist anyone at any time.

Answer:

The zero’s have no value since there behind the decimal point. 53.3896 rounded to the nearest 100th can be 55.3900 or 55.39.

Final answer:

Rounding 55.3896 to the nearest hundredth gives you 55.39, as you round up the second decimal place due to the third decimal place being a 9. Trailing zeros after the decimal can usually be dropped.

Explanation:

When rounding 55.3896 to the nearest hundredth, you need to look at the third decimal place, which is the thousandths place in this case. Since the digit in the thousandths place is a 9, which is greater than 5, you round up the second decimal place (hundredths place) by one. So, 55.3896 rounded to the nearest hundredth is 55.39. It is not necessary to write the trailing zeros after the decimal point unless specifically required for formatting reasons, such as in monetary values or certain scientific contexts. When you round a number and end up with zeros at the end like 55.3900, you can typically drop the trailing zeros to get 55.39.

Answer:

Part 1) The solution of the absolute value is  (-∞,-6)∪ (2,∞)

Number line with open circles on negative 6 and 2, shading going in the opposite directions

Part 2) The graph in the attached figure

Step-by-step explanation:

we have

[tex]\left|2x+4\right|>8[/tex]

we know that

The absolute value has two solutions  

step 1

Find the positive case

[tex]+(2x+4)>8[/tex]

[tex]2x>8-4[/tex]

[tex]2x>4[/tex]

[tex]x>2[/tex]

The solution is the interval ----> (2,∞)

All real numbers greater than 2

step 2

Find the negative case

[tex]-(2x+4)>8[/tex]

Multiply by -1 both sides

[tex](2x+4)<-8[/tex]

[tex]2x<-8-4[/tex]

[tex]2x<-12[/tex]

[tex]x< -6[/tex]

The solution is the interval ----> (-∞,-6)

All real numbers less than -6

therefore

The solution of the absolute value is

(-∞,-6)∪ (2,∞)

Number line with open circles on negative 6 and 2, shading going in the opposite directions

step 3

using a graphing tool

see the attached figure

Answer:

Step-by-step explanation:

The ax+by+c=0 that is confusing you is just the standard form of a linear equation. It is supposed to help you formulate the linear equation. In this case, a = 1, b = -2, c = 1

Therefore,

1x -2y + 1 =0

Now, you said that you are confused on how to isolate and solve for one variable; in this case, you can't. But, you can switch around the places of the variables to solve for one variable. In this case, its best to solve for y, since linear equations are easier to understand written in Slope-intercept form:

y = mx+b

Now, you must be really confused, but look at the work I am about to do so you can learn how to make this easier for you!

1x -2y + 1 =0

-1x             -1x   --> Subtract 1x from both sides to isolate the y variable to the               left side and to keep the equation balanced

-2y + 1=0 -1x

       -1             -1   --> Subtract 1 from both sides to isolate the y variable further and to keep the equation balanced

-2y = -1x-1  

(-2y/-2) = ((-1x-1)/-2)  --> Divide by -2 on both sides to isolate the y variable even further and to keep the equation balanced

y = 1/2x+1/2

y = mx+b

This is written in slope-intercept form. It is called as such since it gives you the slope (written in front of the x variable,in this case 1/2; m = 1/2) and the y-intercept (the letter b; in this case b = +1/2). The y-intercept is where the x coordinate is equal to zero, but it is the place where the line crosses the y-axis. So your b = 1/2, which means that your y-intercept is (0, 1/2)

These are all things you use to graph a line and helps to make it easier to graph them!

Final Answer:

Answer:

A root of f(x) is x=5

Step-by-step explanation:

If (x-5) is a factor of f(x), then 5 is a root.

If (x+5) is a factor of f(x), then -5 is a root.

So we are only given that (x-5) is a factor of f(x), so we only know that x=5 is a root.

This is by factor theorem. It says if (x-c) is a factor then f(c)=0 which means c is a root of f(x) because it makes the expressions equal to 0.

Answer:

Step-by-step explanation:

[tex]\left\{\begin{array}{ccc}y=\dfrac{5}{2}x+2&(1)\\2y=5x+8&(2)\end{array}\right\\\\\text{substitute (1) to (2)}:\\\\2\left(\dfrac{5}{2}x+2\right)=5x+8\qquad\text{use the distributive property}\ a(b+c)=ab+ac\\\\(2)\left(\dfrac{5}{2}x\right)+(2)(2)=5x+8\\\\5x+4=5x+8\qquad\text{subtract}\ 5x\ \text{from both sides}\\\\4=8\qquad\bold{FALSE}\\\\\text{The system of equations has no solution.}[/tex]

The value of 5³i⁹ is 125i. This is found by simplifying i to the 9th power to just i and cubing the number 5 to get 125, then multiplying the two together.

To calculate the value of 5³i⁹, we need to understand how to handle complex numbers and exponents. The expression i, known as the imaginary unit, has the property that i² = -1. Keeping this property in mind, we can simplify i⁹ as i⁸ x i¹, where i⁸ is i² raised to the power of 4, which is (-1)⁴ = 1 because any even power of -1 will always equal 1. Therefore, i⁹ simplifies to i. Now, 5³ means that 5 is being cubed, which results in 5x5x5 = 125. Our final step is then to multiply 125 by i, yielding the result 125i.

I think the correct equation is

c(x) = 200 - 7x + 0.345x^2.

Domain is the set of x-values (i.e. units produced) that are feasible. This is all the positive integer values + 0, in case that you only consider that can produce whole units.

Range is the set of possible results for c(x), i.e. possible costs.

You can derive this from the fact that c(x) is a parabole and you can draw it, for which you can find the vertex of the parabola, the roots, the y-intercept, the shape (it open upwards given that the cofficient of x^2 is positive). Also limit the costs to be positive.

You can substitute some values for x to help you, for example:

x      y

0    200

1    200 -7 +0.345 = 193.345

2    200 - 14 + .345 (4) = 187.38

3    200 - 21 + .345(9) = 182.105

4    200 - 28 + .345(16) = 177.52

5    200 - 35 + 0.345(25) = 173.625

6    200 - 42 + 0.345(36) = 170.42

10  200 - 70 + 0.345(100) =164.5

11 200 - 77 + 0.345(121) = 164.745

The functions does not have real roots, then the costs never decrease to 0.

The function starts at c(x) = 200, decreases until the vertex, (x =10, c=164.5) and starts to increase.

Then the range goes to 164.5 to infinity, limited to the solutcion for x = positive integers.

In order to calculate the percentage you must:

1. Divide 15.6/20.8

2. Your answer will be 0.75

3. Turn this into a fraction 75/100

4. Now turn it into a percent 75%

75% is your answer.

Answer:

58 in^2.

Step-by-step explanation:

This is the sum of the area of 4 small rectangles + the area of the 2 larger  rectangles

= 2*4*1 + 2*5*1 + 2*4*5

=  8 + 10 + 40

= 58 in^2

Answer:

58in^2

Step-by-step explanation:

Answer:

-1/3 is the slope perpendicular

Step-by-step explanation:

When we have 2 points, we can use the formula

m = (y2-y1)/(x2-x1) to find the slope

m = (1-7)/(3-5)

   =-6/-2

    =3

The slope is 3

We want a slope perpendicular

Remember that is the negative reciprocal

- (1/3)

-1/3

Two lines are perpendicular when,

[tex]a_1=-a_2^{-1}[/tex]

Now solve for [tex]a_2[/tex] to get [tex]a_2=-a_1^{-1}[/tex]

First we calculate the slope [tex]a_1[/tex] from the given points [tex]E(x_1,y_1),F(x_2,y_2)\longrightarrow E(5,7),F(3,1)[/tex].

[tex]a_1=\dfrac{\Delta{y}}{\Delta{x}}=\dfrac{y_2-y_1}{x_2-x_1}=\dfrac{1-7}{3-5}=\dfrac{-6}{-2}=3[/tex]

Now use the first formula and insert the data in it to find the value of the second slope [tex]a_2[/tex],

[tex]a_2=-3^{-1}=\boxed{-\dfrac{1}{3}}[/tex]

And that's it.

Hope this helps.

r3t40

For this case we have from the first quadrant that:

[tex]70 + A1 = 90[/tex]

Clearing angle 1:

[tex]A1 = 90-70[/tex]

[tex]A1 = 20\ degrees[/tex]

Ahors, the angle A3 of the third quadrant measures 70 degrees, it is observed that it is opposed by the vertex at the angle of 70 degrees of the first quadrant. So:

[tex]A3-A1 = 70-20 = 50[/tex]

Answer:

Option B

The tower is 75 feet, the wire is 20 feet below the top so the wire is 55 feet above the ground.

The length of the wire is the hypotenuse of a right triangle.

Using the law of cosine:

Cos(angle) = Adjacent leg / Hypotenuse.

Cos(46) = 55 / x

X = 55/cos(46)

x = 79.2 feet

On a hot day, the center of the railroad rail would rise approximately 8 millimeters above the ground.

The expansion of the railroad rail can be calculated using the formula:

[tex]\[ \text{Expansion} = \text{Coefficient of Expansion} \times \text{Original Length} \times \text{Change in Temperature} \][/tex]

In this case, the coefficient of linear expansion for steel (commonly used for railroad rails) is approximately[tex]\(0.000012/\degree C\)[/tex], the original length of the rail is 4 kilometers (or 4000 meters), and the change in temperature is the equivalent of 16 centimeters (or 0.16 meters). Plugging these values into the formula:

[tex]\[ \text{Expansion} = 0.000012 \times 4000 \times 0.16 \][/tex]

[tex]\[ \text{Expansion} = 0.768 \, meters \][/tex]

This is the total expansion of the rail. However, we are interested in the rise of the center, which is half of the total expansion. Therefore, the rise of the center is:

[tex]\[ \text{Rise of Center} = 0.5 \times 0.768 \][/tex]

[tex]\[ \text{Rise of Center} = 0.384 \, meters \][/tex]

To convert this into millimeters, we multiply by 1000:

[tex]\[ \text{Rise of Center} = 384 \, millimeters \][/tex]

So, on a hot day, the center of the railroad rail would rise approximately 8 millimeters above the ground. This expansion due to temperature changes is crucial to consider in engineering and construction to prevent issues such as buckling or warping of materials.

Answer:

y - 1 = 2(x + 2)

Step-by-step explanation:

The equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

Here m = 2 and (a, b) = (- 2, 1), thus

y - 1 = 2(x - (- 2)), that is

y - 1 = 2(x + 2) ← in point- slope form

Answer:

g(x) is option 1 or g(x) = (x + 7)^2 + 5

A quadratic equation has the general form of:

y=ax² +bx + c

It can be

converted to the vertex form in order to determine the vertex of the parabola.

It has the standard form of:y =a(x+h)² + k

where hand k represents the vertex, h represent the point in the x axis and k is thepoint in the y axis. Therefore, from the details given in the problem, the equation that represents

g(x) is option 1 or g(x) = (x + 7)^2 + 5

Answer:

C. Right isosceles

Step-by-step explanation:

We have 2 angles that are the same, that means two sides have to be the same.  That makes the triangle isosceles

There are 3 angles in a triangle.  They add to 180

45+45+x = 180

90+x=180

90-90+x=180-90

x=90

The other angle is a 90 degree angle.  A ninety degree angle is a right angle.

That makes the triangle a right isosceles triangle

Answer: 3347.005 users but you cant divide people in half so its 3347 people

Answer0< x<10

Step-by-step explanation: it says reasonable so this is one of the few time it’s not all positive integers cause it’s a real world question and it’s from 2000 to 2010 so 10 years is the REASONABLE domain for this problem

Step-by-step explanation:

The expected value is the sum of each outcome times its probability.

E = (0.70)(50000) + (0.05)(0) + (0.25)(-3500)

E = 34125

The store is expected to gain $34,125.

To calculate the expected gain or loss for the new store, we multiply each possible outcome by its probability, then sum these values. This results in an expected gain of $34,125 for the store.

The problem requires calculating the expected value of the coffee franchise's new store opening. We use probability and finance to estimate the expected gains or losses.

The expected value (EV) is calculated as follows:

Multiply each outcome by its respective probability.

Sum these products to get the EV.

So, the expected value is:

EV = (0.70 imes $50,000) + (0.05 imes $0) + (0.25 imes -$3,500)

EV = $35,000 + $0 - $875

EV = $34,125

This implies an expected gain of $34,125 for the new store.

Answer:

Step-by-step explanation:

We have to tell all the spheres are similar. As the spheres has no other configuration except for being perfectly round three-dimensionally

Answer:

A sphere is a three-dimensional solid which only has one contribute, its radius or the axis of the sphere. If you have only one measurement you can compare with another sphere, so no matter what a sphere will always be proportional to the other. This making all spheres to be similar just like circles.

Step-by-step explanation:

Answer:

Step-by-step explanation:

3 - x = 9        subtract 3 from both sides

3 - 3 - x = 9 - 3

-x = 6             change the signs

x = -6

Answer:

=  1 2

Step-by-step explanation: Brainly?

We know that [tex]\sin(45)=\cos(45)[/tex] and this is the only point when sin and cos are equal lengths. Because both [tex]\sin(45),\cos(45)=\dfrac{\sqrt{2}}{2}[/tex]

Now if the sin of 30° is a half that would mean that cos of 60° is also a half.

Hope this helps.

r3t40

Answer:

5

Step-by-step explanation:

Add

2 plus 3 equals 5

Step-by-step explanation:

so put two fingers up and then put three up then you get your answer.

Answer:

Step-by-step explanation:

Calculate the mean (simple average of the numbers).

For each number: subtract the mean. Square the result.

Add up all of the squared results.

Divide this sum by one less than the number of data points (N - 1). This gives you the sample variance.

Take the square root of this value to obtain the sample standard deviation.

Answer:

A

Step-by-step explanation:

EDGE 2020