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2 years ago

12

Scores on a history test have average of 80 with standard deviation of 6. What is the z-score for a student who earned a 74 on t

he test? Round your answer to the nearest thousandth.

1 answer:

Olegator [25]2 years ago

5 0

Answer:

12

Step-by-step explanation:

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Jill is standing at the base of her apartment building. She measures the angle of elevation to the top of a nearby tower to be 4

Helga [31]

Answer:

1) From the measure of 40°, you can write:

tan(40°) = 100/x, where x is the base from the building to the tower

⇒x=100/tan(40°) = 119,18 m

2) From the measure of 30°, you can write

tan(30°) = y / 119,18, where y is the height from the roof of Jill's building to the top of the tower.

Then, y = tan(30°) * 119,18 = 68,81 m

3) The height of Jill's building is 100 - 68,81 = 31,19 m

7 0

3 years ago

Round to the nearest half 6.385

iragen [17]

Answer:

6.5

Step-by-step explanation:

I hope you have a great day!!

3 0

3 years ago

Which equation is the inverse of 2(x - 2)2 = 8(7 + y)?

Marina86 [1]

Answer:

The inverse of $2(x - 2)^2 = 8(7 + y)$ is $y=\sqrt{(4x+28)}+2$

Step-by-step explanation:

Given equation : $2(x - 2)^2 = 8(7 + y)$

$\Rightarrow \frac{2(x-2)^2}{8}=7+y\\\Rightarrow \frac{2(x-2)^2}{8}-7=y$

Replace x with y and y with x

So, $\Rightarrow \frac{2(y-2)^2}{8}-7=x\\\Rightarrow \frac{2(y-2)^2}{8}=x+7\\\Rightarrow 2(y-2)^2=8(x+7)\\\Rightarrow (y-2)^2=4(x+7)\\\Rightarrow (y-2)=\sqrt{4(x+7)}\\\Rightarrow y=\sqrt{4(x+7)}+2\\\Rightarrow y=\sqrt{4x+28)}+2$

So, Option C is correct

Hence The inverse of $2(x - 2)^2 = 8(7 + y)$ is $y=\sqrt{(4x+28)}+2$

4 0

2 years ago

Molly is birdwatching at the coast. She has seen 2 egrets and 4 other birds. Considering this data, how many of the next 39 bird

kolbaska11 [484]

Answer:

13 egrets

Step-by-step explanation:

According to the Question,

Given That, Molly is birdwatching at the coast. She has seen 2 egrets and 4 other birds. Considering this data.

Therefore, The next 39 birds Molly sees would you expect to be egrets is

⇒ (39/6)×2 = 13 egrets.

4 0

2 years ago

What is the sum of 1/4+1/10

IgorLugansk [536]

Answer:

simplify: 14/40

not simplify: 7/20

I don't know if it's right but i'm trying to help :)

5 0

3 years ago