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3 years ago

Find f(–2) for the function f(x) = 3x^2 – 2x + 7

2 answers:

4 0

Replace every x in the function with a -2. 3(-2)^2 - 2(-2) + 7. Simplifying gives you 3(4) + 4 + 7. Do the math now. 12 + 4 + 7 = 23

allochka39001 [22]3 years ago

3 0

You're correct its 23 on edge

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What’s A= a+b divided by 2

pentagon [3]

Step-by-step explanation:

A=a+b/2

2×A=a+b

2A=a+b

2a-a=b

a=b

hope it helps

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3 years ago

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Matt walks his dog around the block. The block has a rectangle shape. The dimensions of the block is 3 miles long and 2450 yards

padilas [110]

So first we need to convert all of these to feet:

2450 yards is 7350 feet
3 miles is 15840 feet

Now we need to find the perimeter and then multiply by 2:

2(7350) + 2(15840) = 43680
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3 years ago

Find the values of the 30th and 90th percentiles of the data. Please show your work.

MaRussiya [10]

Answer:

30th percentile:109

90th percentile: 188

Step-by-step explanation:

The given data set is:

129, 113, 200, 100, 105, 132, 100, 176, 146, 152

We arrange the data set in ascending order to obtain;

Array= $100,100,105,113,129,132,146,176,200$

The 30th percentile is located at

$(\frac{30}{100}\times 10 )}$ -th position, where n=10 is the number of items in the data set

This implies that the 30th percentile is at the 3rd position.

Since 3 is an integer, the 30th percentile is the average of the 3rd and 4th occurrence in the array;

This implies that the 30th percentile = $\frac{105+113}{2}=\frac{218}{2}=109$

The 90th percentile is located at

$(\frac{90}{100}\times 10 )}$ -th position, where n=10 is the number of items in the data set

This implies that the 90th percentile is at the 9th position.

Since 9 is an integer, the 90th percentile is the average of the 9th and 10th occurrence in the array;

This implies that the 90th percentile = $\frac{176+200}{2}=\frac{376}{2}=188$

6 0

3 years ago

Find the value of x. Round to the nearest tenth.

yarga [219]

36
i think. hope it helped sorrh if it’s wrong i’m not good at math

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3 years ago

A ramp leading into a building makes a 15o angle with the ground. The end of the ramp is 10 feet from the base of the building.

Allushta [10]

Pls. see attachment. I drew my answer.

The ramp is approximately 10.40 feet long.

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4 years ago

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