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2 years ago

K - 2k =?the answer will have the letter k in it

1 answer:

mihalych1998 [28]2 years ago

7 0

Hi there

K - 2k = -k

Let me show my work.

In front of the letter K there is 1 which not written....

so its like you had 1 - 2k
1 - 2 = -1
but there's also the letter k with it.
You write -k instead because you can't put -1k.That's not math :)

Final answer : -k

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Answer:

25.2 minutes

Step-by-step explanation:

step 1

Find the area of the given wall

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step 2

we know that

You can paint 75 square feet of a surface every 45 minutes

using proportion

Find out how long it takes you to paint a surface area of 42 square feet

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2 years ago

Suppose x + y = 13 and the value of x increases by 4. If their sim remain the same, what must happen to the value of y?

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3 years ago

Read 2 more answers

The heights (measured in inches) of men aged 20 to 29 follow approximately the normal distribution with mean 69.3 and standard d

Zolol [24]

Answer:

The middle 92% of all heights fall between 64.4 inches and 74.2 inches.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 69.3, \sigma = 2.8$

Between what two values does that middle 92% of all heights fall?

The middle 92% falls from X when Z has a pvalue of 0.5 - 0.92/2 = 0.04 to X when Z has a pvalue of 0.5 + 0.92/2 = 0.96. So from the 4th percentile to the 96th percentile.

4th percentile

X when $Z = -1.75$

$Z = \frac{X - \mu}{\sigma}$

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$X - 69.3 = -1.75*2.8$

$X = 64.4$

96th percentile

X when $Z = 1.75$

$Z = \frac{X - \mu}{\sigma}$

$1.75 = \frac{X - 69.3}{2.8}$

$X - 69.3 = 1.75*2.8$

$X = 74.2$

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2 years ago

URGENT WILL GIVE BRAINLIEST IF CORRECT!!!

umka2103 [35]

Both A and B would be correct to use. You can use an example of your own to check it yourself. For example I did 10 emails all together and kept trying with the equations.

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2 years ago