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3 years ago

5

Explain how you can find the missing number in 3 4/5 / missing number = 2 5/7

1 answer:

hram777 [196]3 years ago

3 0

Cause you have the slashes and 2/4/5/6/7and 3/4/5/6/7

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8. myles had 103 coins in a jar - all nickels, dimes, and quarters. if the total value of the coins is $15

Ivanshal [37]

If the total value of the coins is $15. The number of each type of coin is: 31 quarters, 72 dimes.

<h3>Number of each type of coin</h3>

Let D = number of dimes

Let Q = the number of quarters

Equations

d + q = 103

0.10d + 0.25q = 15

d = 103 -q

0.10(103 -q) + 0.25q = 15

10.3 - 0.10q + 0.25q = 15

0.15q = 4.7

q=4.7/0.15

q=31 quarters

Substitute q into second equation

D+31=103

D=72 dimes

Therefore the number of each type of coin is: 31 quarters, 72 dimes.

Learn more number of each coin here:brainly.com/question/13934075

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5 0

2 years ago

I need help! I will give brainliest!

trapecia [35]

Answer:

2nd linear equation represents the graph

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Suppose 12% of students surveyed said they have tried riding a zip line.

Arisa [49]

Answer:

12.

12% of 100= 12.

6 0

3 years ago

Water boils at different temperatures at different elevations. The boiling temperature of water is 212 degrees * F sea level (0

Nikolay [14]

Answer:

The elevation when the boiling point of water is $190$ ° $F$ is 12790.70 feet

Step-by-step explanation:

Let every 1,000 feet of elevation be $x$ . Hence, we can write

$T = 212$ $- 1.72x$

Where $T$ is the boiling temperature of water at different elevations

Now, to the determine the elevation when the boiling point of water is $190$ ° $F$ .

We will determine $x$ by putting $T = 190$ ° $F$ .

Hence,

$T = 212$ $- 1.72x$

$190$ $= 212$ $- 1.72x$

$190 - 212$ $= - 1.72x$

$- 22$ $= - 1.72x$

$22 = 1.72x\\x = \frac{22}{1.72} \\x = 12.79070$

Since $x$ represents every 1,000 feet of elevation, then the elevation when the boiling point of water is $190$ ° $F$

$12.79070$ × $1000\\$ $= 12790.70$ feet

Hence, the elevation when the boiling point of water is $190$ ° $F$ is 12790.70 feet

8 0

4 years ago

Suppose that a researcher is planning a new study on hemoglobin levels amongst women under 25 years old. Previous research sugge

Mariulka [41]

Answer:

A sample size of at least 531 is required.

Step-by-step explanation:

We are lacking the confidence level to solve this question, so i am going to use a 90% confidence level.

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

$\alpha = \frac{1-0.9}{2} = 0.05$

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 $1-0.05 = 0.95$ , so $z = 1.645$

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.

Find the required sample size for the new study.

A sample size of at least n is required.

n is found when $M = 0.05$

We have that $\sigma = 0.7$

So

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

$0.05 = 1.645*\frac{0.7}{\sqrt{n}}$

$0.05\sqrt{n} = 1.645*0.7$

$\sqrt{n} = \frac{1.645*0.7}{0.05}$

$(\sqrt{n})^{2} = (\frac{1.645*0.7}{0.05})^{2}$

$n = 530.4$

Rounding up

A sample size of at least 531 is required.

5 0

3 years ago