Answer:
When a matrix is multiplied by its inverse the result will be the identity matrix. If we multiply two matrix with the same size, the resulting matrix will have the same dimension.
Therefore, if we multiply the matrices X and Y we will get a 2x2 identity matrix, as follows:
[tex]\left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right][/tex]
Answer:
[tex]\left[\begin{array}{ccc}1&0\\0&1\end{array}\right][/tex]
Step-by-step explanation:
We are asked find the matrix that represent the product of matrices X and Y both measures [tex]2\times 2[/tex] and inverse of each other.
For a matrix multiplication to be defined, the number of columns in the first matrix must be equal to number of rows in the second matrix.
Since the both matrices are [tex]2\times 2[/tex] (same number of column and row), then the product of both matrices would result in [tex]2\times 2[/tex] matrices.
We also know that the multiplication of a matrix with its inverse results in identity matrix.
Therefore, our matrix would be a [tex]2\times 2[/tex] identity matrix as:
[tex]\left[\begin{array}{ccc}1&0\\0&1\end{array}\right][/tex].
There is a pie eating contest with 9participants. There are 46 pies that are all eaten. Which of the following best describes how many pies each person ate if they are very evenly matched?
To determine the average number of pies eaten by each participant in a contest with 9 participants and 46 pies, divide the total pies by the total participants. The result is approximately 5.11 pies per person, indicating they ate very evenly with most having eaten about 5 pies.
The question asks us to find out how many pies each person ate in a pie eating contest with 9 participants and 46 pies consumed. To calculate this, we divide the total number of pies by the number of participants. Here's the calculation:
Divide 46 pies by 9 participants to get the average number of pies per person.
The result is approximately 5.11 pies per person.
Since we can't have a fraction of a pie eaten in a real context, it suggests that participants ate either 5 or 6 pies each, if they are very evenly matched.
Therefore, the best description of how many pies each person ate, assuming they are very evenly matched, would be approximately 5 pies per person, with some participants possibly having eaten 6 pies to account for the total of 46 pies.
Solve the system of linear equations by graphing.
y = –x – 7
x + 2y = 4
What is the solution to the system of linear equations?
(–4.5, 4.25)
(–1.7, –2.8)
(0, –7)
(3, 0.5)
The solution to the system of linear equations is (3, 0.5).
To solve the system of linear equations by graphing, we'll plot the two equations on the same set of axes and find the point of intersection, which represents the solution.
Start with the first equation, y = -x - 7. Choose a few x-values, calculate the corresponding y-values, and plot the points on the graph.For the second equation, x + 2y = 4, rewrite it in slope-intercept form (y = mx + b) by solving for y: 2y = -x + 4 → y = -0.5x + 2. Plot points using this equation.The point where the two graphs intersect is the solution. Confirm that the coordinates of this point satisfy both equations.The solution is (3, 0.5). Confirming for the first equation: y = -3 - 7 = -10 and for the second equation: 3 + 2(0.5) = 4. The coordinates match both equations.
A bag of marbles contains 3 yellow marbles, 4 blue marbles, and 8 red marbles. Which of the following is true of selecting a marble that is a primary color (red, yellow, or blue)? Select all that apply.
The probability is
This event is certain to happen.
This event will not happen.
The probability is 1.
The probability is 0.
Answer:
the probability is the event is certain to happen
Step-by-step explanation:
Answer:
This event is certain to happen.
The probability is 1.
Step-by-step explanation:
Probability theory aims to explain the chance of an event occurring. In this case, there are 3 yellow balls, 4 blue balls and 8 red balls. The total of balls will be 3 + 4 + 8 = 15
If a random ball is removed, it can be any of three colors. The color that has the most balls will have a higher chance of being chosen from the 15 totals.
Likelihood of drawing a red ball: 8/15
Probability of a yellow ball: 3/15
Blue ball probability: 4/15
The question explains that only one ball will be removed and explains that there are only 3 colors. Therefore, when removing a ball, it will certainly be one of three colors.
This can be confirmed by adding the probability of each ball: 8/15 + 3/15 + 4/15 = 15/15 = 1
Thus, if a primary ball is removed, it will certainly be one of three colors. Moreover we can say that chance of being red is greater than being blue, which is greater than being yellow.
40 POINTS
The sides of an isosceles triangle are 5, 5, and 7. Find the measure of the vertex angle to the nearest degree.
Answer:
Answer:
89
°
to the nearest degree.
Explanation:
The base of the triangle 7 can be divided in half by a line of symmetry of the isosceles triangle, which will bisect the vertex angle. This creates two right triangles:
Each with a base of 3.5 and a hypotenuse of 5.
The side opposite the half of the vertex angle is 3.5, the hypotenuse is 5.
The sine function can be used to find the angle.
sin
θ
=
o
p
p
h
y
p
sin
θ
=
3.5
5
=
0.7
Use the inverse sin function or a table of trig functions to find the corresponding angle . (Arcsin)
arcsin
0.7
=
44.4
°
Remember that this is the value of half of the vertex angle so double the value to find the vertex angle.
2
×
44.4
=
88.8
°
rounded off to the nearest whole degree =
89
°
Find the volume of a cylinder that has a radius of 7 and a height of 18.
Answer:
V≈2770.88
Step-by-step explanation:
The volume of a cylinder that has a radius of 7 and a height of 18 is 2770.88.
In order to find the answer, you should use the formula πr²h.
R means radius and H means Height.
V=πr2h=π·72·18≈2770.88472
Answer:
V = 882pi units^3
or approximately
2769.48 units^3
Step-by-step explanation:
The column of a cylinder is given by
V = pi * r^2 * h
We know the radius is 7 and the height is 18
V = pi * 7^2 *18
V =pi *49 *18
V =882 pi
If we want an approximate answer, we can approximate pi by 3.14
V = 3.14 * 882
V =2769.48
I need help please.
Answer:
The factors of 2q²-5pq-2q+5p are (2q-5p) (q-1)....
Step-by-step explanation:
The given expression is:
2q²-5pq-2q+5p
Make a pair of first two terms and last two terms:
(2q²-5pq) - (2q-5p)
Now factor out the common factor from each group.
Note that there is no common factor in second group. So we will take 1 as a common factor.
q(2q-5p) -1(2q-5p)
Now factor the polynomial by factoring out the G.C.F, 2q-5p
(2q-5p) (q-1)
Thus the factors of 2q²-5pq-2q+5p are (2q-5p) (q-1)....
Is the answer 4/5 ? Can someone help please ?
Answer:
[tex]m=-\frac{4}{5}[/tex]
Step-by-step explanation:
We can take 2 arbitrary points in the graph and solve for slope using the formula shown below.
Note: we will use the 2 points (2,-3) & (-3,1)
Where x_1 = 2, y _1 = -3 and x _ 2 = -3 and y _ 2 = 1
The formula:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
Let's plug the numbers and find the slope:
[tex]m=\frac{1-(-3)}{-3-2}\\m=\frac{4}{-5}\\m=-\frac{4}{5}[/tex]
Hence, thsi is the slope.
the graph shows a system of equations
What is the solution to the system of equations?
A.(-1,3)
B.(1, -3)
C.(1,3)
D.(-1,-3)
Answer:
B. (1, -3)Step-by-step explanation:
The solution of the system of equations is the coordinates of the intersection of the lines.
(1, -3)
Answer:
B.(1, -3)
Wherever the lines intersect is the solution. Hope this helps!
Step-by-step explanation:
Situation 1: In Lakeville, Melinda’s television cable bill is a flat rate of $50 per month, plus $1.50 for every movie she rents. After one month of service, her bill is $66.25.
Situation 2: In Oceanside, Kimberly’s television cable bill is a flat rate of $60 dollars per month, plus $1.25 for every movie she rents.
If you were to model these two situations with equations to solve for all the unknowns, what similarities and differences would the equations have? Can you solve for all the unknowns in both situations?
Answer:
situation 1 : flat rate of 50....1.50 per movie.....after 1 month her bill is 66.25
66.25 = 1.50x + 50
situation 2 : flat rate of 60....1.25 for every movie...
y = 1.25x + 60
both situations have a flat rate fee plus a charge for every movie. In situation 1, u can solve for x (the number of movies rented) because u know how much she was charged. However, in situation 2, without more information, u cannot solve this equation...what u would need to solve it would either be the number of movies rented or the total bill showing what she was charged. So basically, in situation 1, u are given more information then in situation 2.....enough information to be able to solve for the variable x...whereas, in situation 2, u are not given enough info to solve for a variable and get a numerical answer
BRAINLIEST PLEASE!!!!!
Answer: Situation 1 involves one independent variable that stands for the number of movies Melinda rented. Situation 1 gives a total for the monthly bill, but situation 2 does not give a total for the monthly bill. Because situation 2 leaves the total value out, it needs an additional variable. Therefore, situation 2 involves two variables—the number of movies Kimberly rented (the independent variable) and the monthly cable bill (the dependent variable). In this situation, we can’t solve for one variable without knowing the other.
Step-by-step explanation: ed.men.tum answer. DO NOT copy and paste!
solve the system by graphing.
y=x+2
y=-2x+2
A.(0,2)
B.(2,0)
C.(0,-2)
The coordinates of △ABC are A(−11,7), B(−5,−3), C(−2,3). After a dilation, the coordinates are A'(22,−14), B'(10,6), C'(4,−6). Find the scale factor.
Answer:
-2
Step-by-step explanation:
Before a dilation you have the point (x,y).
After a dilation of a scale factor of r you have (r*x,r*y).
Let's look at one pair of corresponding points.
A(-11,7) and A'(22,-14)
We need to figure out what we can multiply to -11 to get 22.
We need to figure out what we can multiply to 7 to get -14.
Hopefully it is the same number or this isn't a dilation.
So to get from pre-image to image you need to multiply by -2 because -11*-2=22 and 7*-2=-14.
The scale factor is -2.
The dilation is this: (x,y)->(-2x,-2y)
The required scale factor is -2
What is scale factor?The scale factor is a measure for similar figures, who look the same but have different scales or measures.
How to find the scale factor? We know that if we have the point (x, y) before a dilation and (ax, ay) after a dilation, then a is the scale factorLet's consider one pair of corresponding points.
A(-11,7) and A'(22,-14)To get the scale factor we need to find out what we can multiply to -11 and 7 to get 22 and -14Clearly we need to multiply by -2.
This is applicable for all the points
So, the scale factor is -2.
Find more about "Scale factor" here: https://brainly.com/question/10253650
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I need help with this.
Answer:
(a) Plan B, $4 more
(b) 140, Plan A
I need help solving
[tex]3D-2E=3\left[\begin{array}{cc}5&5\\-3&7\\1&3\end{array}\right] -2\left[\begin{array}{cc}6&7\\2&-7\\0&5\end{array}\right] \\\\3D-2E=\left[\begin{array}{cc}15&15\\-9&21\\3&9\end{array}\right] -\left[\begin{array}{cc}12&14\\4&-14\\0&10\end{array}\right] \\\\3D-2E=\left[\begin{array}{cc}3&1\\-13&35\\3&-1\end{array}\right][/tex]
X-y +2=-1
X+y +32=-3
2x-y +22=0
Why is this the graph of the function f(x)=4x^2-8x+7?
Answer:
I'll be referring to this form: ax^2-bx+c
The 4x^2 is the rate that it goes up. If a is greater than 1, then that means the graph gets narrower from the parent function x^2. You can clearly see that in that graph.
The c is always the y-intercept. In this case, you can see that it's 7. The graph clearly shows 7 as it's y-intercept as well, so that matches well.
Sadly, I do not know how to compare the 8x into this situation without a calculator, but that information should be quite enough to see how that function is in that graph.
if A= (-1,3) and B=(11,-8) what is the length of ab
Answer:
16.3 units ( to 1 dec. place )
Step-by-step explanation:
Using the distance formula
d = √ (x₂ - x₁ )² + (y₂ - y₁ )²
with (x₁, y₁ ) = A(- 1, 3) and (x₂, y₂ ) = B(11, - 8)
AB = [tex]\sqrt{(11+1)^2+(-8-3)^2}[/tex]
= [tex]\sqrt{12^2+(-11)^2}[/tex]
= [tex]\sqrt{144+121}[/tex]
= [tex]\sqrt{265}[/tex] ≈ 16.3 ( to 1 dec. place )
Given that h=10, b=5, and r=3.8, find the area of the unshaded region. Use 3.14 for π as necessary. All answers are expressed in square units.
A. 70.34
B. 36.93
C. 25
D. 20.34
The area of the circle is found using the formula Area = PI x r^2
The area of a triangle is found using the formula Area = 1/2 x base x height.
Using the given dimensions:
Area of the circle = 3.14 x 3.8^2 = 45.3416 square units.
The area of the triangle is 1/2 x 5 x 10 = 25 square units.
To find the area of the unshaded part, subtract the area of the shaded triangle from the circle:
Area = 45.3416 - 25 = 20.3416
Round to two decimal places = 20.34
The answer is D. 20.34
D. 20.34
In this case, we must calculate first the Areas of the Triangle ([tex]A_{t}[/tex]), in square units, and the Circle ([tex]A_{c}[/tex]), in square units, later we subtract the Area of the former from the Area of the latter to determine the Area of unshaded region ([tex]A_{u}[/tex]), in square units. The Area formulas for each figure are, respectively:
Triangle
[tex]A_{t} = \frac{1}{2}\cdot b\cdot h[/tex] (1)
Circle
[tex]A_{c} = \pi\cdot r^{2}[/tex] (2)
Unshaded Area
[tex]A_{u} = A_{c} - A_{t}[/tex] (3)
Where:
[tex]h[/tex] - Height of the triangle.
[tex]b[/tex] - Base of the triangle.
[tex]r[/tex] - Radius of the circle.
If we know that [tex]h = 10[/tex], [tex]b = 5[/tex] and [tex]r = 3.8[/tex], then the area of the unshaded region is:
[tex]A_{t} = \frac{1}{2}\cdot (5)\cdot (10)[/tex]
[tex]A_{t} = 25[/tex]
[tex]A_{c} = \pi\cdot 3.8^{2}[/tex]
[tex]A_{c} \approx 45.365[/tex]
[tex]A_{u} = 45.365-25[/tex]
[tex]A_{u} = 20.365[/tex]
The correct answer is D.
Please see this question related to Area problems: https://brainly.com/question/16151549
How many multiples of three are between 10 and 787 and show work pls
As per the concept of arithmetic sequence, there are 259 multiples of three between 10 and 787
To solve this problem, we need to find the first and last multiples of three within the given range and then count how many integers are there in between
Step 1: Find the first multiple of three greater than or equal to 10.
The first multiple of three greater than or equal to 10 is 12.
Step 2: Find the last multiple of three that is less than or equal to 787.
The largest multiple of three less than or equal to 787 can be calculated as follows:
Divide 787 by 3:
787 ÷ 3 ≈ 262.33
The largest multiple of three less than or equal to 787 is:
262 × 3 = 786
Step 3: Count the multiples of three within the range.
Now that we have found the first and last multiples of three within the range, we need to count the number of multiples of three between them, including the endpoints.
The multiples of three between 12 and 786 are:
12, 15, 18, ..., 783, 786.
Step 4: Calculate the total count of multiples.
To calculate the total count, we can use the formula for finding the number of terms in an arithmetic sequence:
Number of terms = (last term - first term) / common difference + 1.
In this case, the first term is 12, the last term is 786, and the common difference (the difference between consecutive terms) is 3.
Number of terms = (786 - 12) / 3 + 1
Number of terms = 774 / 3 + 1
Number of terms = 258 + 1
Number of terms = 259.
To know more about multiples here
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What is the simplified form of the quantity y squared plus 7y plus 12 over the quantity y squared minus 3y minus 18?
y minus 4 over y minus 6
y minus 4 over y plus 6
y plus 4 over y minus 6
y plus 4 over y plus 6
Answer:
The correct option is C
Step-by-step explanation:
The given expression is:
=y²+7y+12/y²-3y-18
Break the middle term of both the numerator and denominator:
=y²+4y+3y+12/y²-6y+3y-18
Take the common from the expressions:
=y(y+4)+3(y+4)/y(y-6)+3(y-6)
=(y+3)(y+4)/(y+3)(y-6)
The same terms will be cancelled: Then we have,
=(y+4)/(y-6)
Therefore the correct option is C....
Answer:
A iS the answer i got it right on my test
Step-by-step explanation:
Y-4/Y-5
Drag steps in the given order to evaluate this expression. -3(-3+2)-6
Answer:
The value of the expression is -3.
Step-by-step explanation:
Consider the provided expression.
[tex]-3(-3+2)-6[/tex]
Step 1: Solve the parentheses.
[tex]-3(-1)-6[/tex]
Step 2: Open the parentheses.
[tex]3-6[/tex]
Step 3: Subtract the like terms.
[tex]-3[/tex]
Hence, the value of the expression is -3. The required steps is shown above.
An item is regularly priced at $39. Ashley bought it at a discount of 55% off the regular price.
55% off the regular price means she paid 45% of the regular price. ( 100% - 55% = 45%
Multiply the original price by 45%:
39 x 0.45 = 17.55
She paid $17.55
(If you need to know how much she saved: 39 - 17.55 = $21.45)
Answer:
Ashley bought the item for $17.55
need help with 5-8 , please help!!!!!
Please help with 1 and 2
Answer:
1. B. a=14, b=2
2. D. a=1, b=1.4
Step-by-step explanation:
The exponential growth function can be represented as
[tex]y=a\cdot b^x,[/tex]
where b is the growth factor.
1. When the function has equation
[tex]g(x)=14\cdot 2^x,[/tex]
then
[tex]a=14,\\ \\b=2[/tex]
The initial amount is the value of the function at x=0:
[tex]g(0)=14\cdot 2^0=14\cdot 1=14[/tex]
The growth factor is b=2
2. When the function has equation
[tex]f(t)=1.4^t,[/tex]
then
[tex]a=1,\\ \\b=1.4[/tex]
The initial amount is the value of the function at t=0:
[tex]f(0)=1.4^0=1[/tex]
The growth factor is b=1.4
Select the equivalent forms.
50% =
10% =
75% =
Answer:
The answers would be:
1) 1/2
2) 1/10
3) 3/4
Step-by-step explanation:
Percentages are always calculated by multiplying the percentages with 100. Like in this example, 50% means 0.5. This 0.5 was multiplied before by 100 to get this percentage. So to find out the equivalent forms, we would simplify the percentage like:
50%-------> 0.5
10%--------> 0.1
75%--------> 0.75
So
0.5 means 1/2 of the total value
0.1 means 1/10 of the total value
0.75 means 3/4 of the total value.
Answer:
Took Quiz 100%.... 50%= 0.50 and 10%= 0.10 and 75% =0.75
Solve the following system:
y = x + 3
4x + y = 18
A.(6,3)
B.(3,6)
C.(-3,6)
D.(3,-6)
Answer:
B. (3, 6)Step-by-step explanation:
[tex]\left\{\begin{array}{ccc}y=x+3&(1)\\4x+y=18&(2)\end{array}\right\\\\\text{substitute (1) to (2):}\\\\4x+(x+3)=18\\\\(4x+x)+3=18\qquad\text{subtract 3 from both sides}\\\\5x=15\qquad\text{divide both sides by 5}\\\\x=3\\\\\text{put the value of x to (1):}\\\\y=3+3\\\\y=6[/tex]
In each family of functions, the _____function is the most basic function in
the family.
Answer:
parent funtion is most basic
Step-by-step explanation:i just took the test
There are 22 animals in the barn. Some are geese and some are goats. There are 82 legs in all. How many of each animal are there? Please answer
Let the number of geese be x.
Then number of goats is 22-x.
A goose has 2 legs, and a goat has 4.
There are a total of 82 legs.
So,
2x + 4(22-x) = 82
2x + 88 - 4x = 82
-2x = -6
x = 3
There are 3 geese and (22-3=) 19 goats.
Please mark Brainliest if this helps and feel free to ask doubts!
PLEASE HELP! WILL MARK BRAINLIEST!!
A surveyor is “shooting a line” to a point on a tree 70 m from his current position. After rotating his surveying instrument 25° to the left, he “shoots” another line to a point on a fence post 35 m away. Determine the distance between the point on the tree to the point on the fence post. (Do not assume that the triangle shown is a right triangle) Show all work. Round answer to the nearest hundredths.
Use the Law of Sines to find the measure of
Find the measure of
Answer:
41.04 meters
Step-by-step explanation:
The questions which involve calculating the angles and the sides of a triangle either require the sine rule or the cosine rule. In this question, the two sides that are given are adjacent to each other the given angle is the included angle. The initial position is given by A. The tree is denoted as C and the fence post is denoted as B. Since the use of sine rule will complicate the question, it will be easier to solve this question using the cosine rule. Therefore, cosine rule will be used to calculate the length of BC. The cosine rule is:
BC^2 = AB^2 + AC^2 - 2*AB*AC*cos(BAC).
The question specifies that AC = 70 meters, BAC = 25°, and AB = 35 meters. Plugging in the values:
BC^2 = 35^2 + 70^2 - 2(35)(70)*cos(25°).
Simplifying gives:
BC^2 = 1684.091844.
Taking square root on the both sides gives BC = 41.04 meters (rounded to two decimal places).
Therefore, the distance between the point on the tree to the point on the fence post is 41.04 meters!!!
The function f(x) 32(1.5) represents the chipmunk population of a forest x years after it was first studied. What was the original population of chipmunks?
A) 32
B) 21
C) 48
D) 72
Answer:
A) 32
Step-by-step explanation:
I will assume the function is
f(x) = 32 (1.5)^x
This is in the form
y =a b^x
in which a is the initial value, b is the growth rate, x is the time
a =32, which is the initial population
b= 1.5, which means 1.5-1 = .5. which means it grows at a 50% increase
x = number of years
Plz help me! Find the perimeter of the shape
Answers and the shape are in the picture
I believe the answer would be 12.4 the first choice.
Answer:
=12.4 units
Step-by-step explanation:
We can use the Pythagoras theorem to find the lengths of EF, FG, and HE
(GF)²=(ΔX)²+(Δy)²
(GF)²=(2--1)²+(4-3)²
=3²+1²
=10
GF=√10=3.16 units
(EF)²=(Δx)²+(Δy)²
=(2--1)²+(6-4)²
=3²+2²
=9+4
=13
EF=√13=3.61 units
(HE)²=(Δx)²+(Δy)²
=(-1--3)²+(6-3)²
=2²+3²
=4+9
=13
HE=√13=3.61 units
GH=(-1--3)=2 units
Perimeter =GF+EF+EH+HG
=3.16+3.61+3.61+2
=12.38 units
=12.4 units to 1 decimal place.