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3 years ago

PLEASE HELP!!!!!!

Mathematics

1 answer:

pickupchik [31]3 years ago

4 0

9514 1404 393

Answer:

$\left[\begin{array}{ccc}-1&-1&3\\1&-2&-2\end{array}\right]$

Step-by-step explanation:

The 270° CCW rotation is described by the transformation ...

(x, y) ⇒ (y, -x)

That is, the first row of the transformed coordinate matrix is the same as the second row of the input matrix. The second row of the output matrix is the opposite of the first row of the input matrix.

$\left[\begin{array}{ccc}-1&-1&3\\1&-2&-2\end{array}\right]$

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One number is 2 more than 3 times another. Their sum is 22. Find the numbers. 8, 14 5, 17 2, 20 4, 18 10, 12

xxTIMURxx [149]

9514 1404 393

Answer:

(b) 5, 17

Step-by-step explanation:

You can try the answer choices easily enough.

2 +3×8 ≠ 14

2 +3×5 = 17 . . . . this choice works (5, 17)

2 +3×2 ≠ 20

2 +3×4 ≠ 18

2 +3×10 ≠ 12

Or, you can solve the equation:

x + (2 +3x) = 22

4x = 20 . . . . . . . . subtract 2

x = 5 . . . . . . . . . . divide by 4

The numbers are 5 and (22 -5) = 17.

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3 years ago

The kindergarten class has 10 girls and 10 boys. If two students are chosen at random to be in the school play, what is the prob

Akimi4 [234]

50% because there's equal value of both variables

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3 years ago

Read 2 more answers

Suppose the population standard deviation is σ = 5 , an SRS of n = 100 is obtained, and the confidence level is chosen to be 98%

beks73 [17]

Answer:

1.165.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.98}{2} = 0.01$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.01 = 0.99$ , so $z = 2.33$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this problem, we have that:

$\sigma = 5, n = 100$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$M = 2.33*\frac{5}{\sqrt{100}} = 1.165$

So the correct answer is:

1.165.

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3 years ago

What is the distance between points (2, −8) and (2, 7) on a coordinate plane?

MatroZZZ [7]

Answer:

15 points vertically.

Step-by-step explanation:

change -8 to 8, then add the 2 numbers in the y axis and you will get 15. brainliest?

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3 years ago

3 2/7 fraction that have the same value

zimovet [89]

46/14. Hoped this helped!

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3 years ago