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kakasveta [241]

4 years ago

6

One month ruby worked six hours more than Isaac and svetlana worked four times as much hours as ruby together they worked 126 ho

urs find the number of hours each person work

1 answer:

natulia [17]4 years ago

4 0

R=I+6 S=4R I

I+(I+6)+4(I+6)=126

Basic algebra (I dont know how to show it) leaves you with: 6I = 90, divide both sides by 6 and I=15

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The length of time before a seed germinates when falling on fertile soil is approximately Normally distributed with a mean of 60

PIT_PIT [208]

Answer:

b. 0.12

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:

$\mu = 600, \sigma = 100$

What is the probability that a seed will take more than 720 hours before germinating?

This is 1 subtracted by the pvalue of Z when X = 720. So

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

$Z = \frac{720 - 600}{100}$

$Z = 1.2$

$Z = 1.2$ has a pvalue of 0.88.

1 - 0.88 = 0.12

So the correct answer is:

b. 0.12

4 0

3 years ago

A mountain road is 5 miles long and gains elevation at a constant rate. After 2 miles, the elevation is 5500 feet above sea leve

geniusboy [140]

Answer:

It starts at 2000 feet

7, 8

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Please help!<br> Rewrite the rational exponent as a radical. (2 points)

vladimir2022 [97]

Answer:

<em>Answer:</em> 3) $\sqrt{5}$

Step-by-step explanation:

<u>Radical Form and Exponent Form</u>

A radical can be expressed as a rational exponent following the identity:

$\displaystyle \sqrt[m]{x^n}=x^\frac{n}{m}$

We should also recall that:

$(x^n)^m=x^{nm}$

We are given the expression:

$\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}$

Applying the power of power:

$\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}=\left(5^{\frac{3}{4}\cdot \frac{2}{3}}\right)$

Simplifying:

$\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}=5^{\frac{1}{2}}$

Converting to radical form:

$\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}=\sqrt{5}$

Answer: 3) $\sqrt{5}$

8 0

3 years ago

What is 2+2... your welcome

irina1246 [14]

4 duh ....... 2+2=4........................

6 0

3 years ago

Read 2 more answers

A class is made up of 8 boys and 8 girls

rodikova [14]

Hello,

The answer is "8:8 or 1".

Reason:

There are 8 boys and 8 girls therefore the ratio would be...

8:8

8:8=1

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit

3 0

3 years ago