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3 years ago

7

20% of all the children in a class are left handed. 4 children are left handed. How many children are there in the class all tog

ether?

1 answer:

Katarina [22]3 years ago

7 0

There are 20 students all together.

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In a machine, a large gear completes a revolution every minute while a small gear completes a revolution every 24 seconds. if th

UkoKoshka [18]

To make the second gear be aligned with the first, it will have to rotate 5 times, a total of 120 seconds or 2 minutes will pass.

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3 years ago

Choose the best estimate for the division problem below.

EleoNora [17]

Answer:

10

Step-by-step explanation:

68.362/7.12

Multiply the top and bottom by 1000

68362/7120

Rounding to the nearest 1000

70000/7000

10

8 0

3 years ago

Read 2 more answers

A line goes through the points (8,9) (-2,4)

SIZIF [17.4K]

Answer:

y-9=1/2(x-8)

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(4-9)/(-2-8)

m=-5/-10

m=1/2

y-y1=m(x-x1)

y-9=1/2(x-8)

8 0

3 years ago

Researchers report that on average freshman who live on campus gain 15 pounds during their first year in college. You survey 10

neonofarm [45]

Answer: 1.460

Step-by-step explanation:

Given : Researchers report that on average freshman who live on campus gain 15 pounds during their first year in college.

Let $\mu$ represents the population mean .

Then, the set of hypothesis will be:-

$H_0: \mu=15$

$H_a:\mu\neq15$

We assume that this is normal distribution.

Sample size : n = 10, which is a small sample (n<30) ,s o we use t-test.

Sample mean : $\overliene{x}=16.2\ lbs$

Standard deviation : $\sigma=2.6$

The test statistic for population mean for small sample is given by :-

$t=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

$t=\dfrac{16.2-15}{\dfrac{2.6}{\sqrt{10}}}=1.45951276623\approx1.460$

Hence , the value of test statistic = 1.460

4 0

3 years ago

What is cos (x)?<br><br> 48/58<br><br> 58/48<br><br> 26/58<br><br> 58/26

Evgen [1.6K]

<span>We have to calculate the length of the missing side.
Use the Pythagorean theorem:

$a^2+32^2=58^2\\\\a^2+1024=3364\ \ \ |-1024\\\\a^2=2340\to a=\sqrt{2340}\\\\a=\sqrt{36\cdot65}\\\\a=6\sqrt{65}$

$\cos x=\dfrac{6\sqrt{65}}{58}=\dfrac{3\sqrt{65}}{29}$

I think. Your answers to choice are wrong.
</span>

8 0

3 years ago