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Tema [17]
2 years ago
5

4. A comprehensive study conducted by the National Institute of Child Health and Human Development tracked more than 1,000 child

ren from an early age through elementary school (New York Times, November 1, 2005). The study concluded that children who spent more time than 30 hours a week in child care before entering school tended to score higher in math and reading when they were in the third grade. The researchers cautioned that the findings should not be a cause for alarm because the differences were found to be small. Explain how the difference between the math and reading score for the child care group and the overall mean for third graders could be small but the researchers could still reach the conclusion that the mean for the child care group is significantly higher than the overall mean.
Mathematics
1 answer:
andrezito [222]2 years ago
7 0
Yes that’s right all
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Prove the trigonometric identity!<br><br> Please help!! 50 Points!
Rudiy27

Answer:

:)

Step-by-step explanation:

For simplicity I will substitue x for β.

1-sin(2x)=(cosx-sinx)^2\\1-2sin(x)cos(x)=cos^2x-2sin(x)cos(x)+sin^2x\\1=cos^2(x)+sin^2(x)\\1=1

In the first step I used the identity

sin(2x)=2sin(x)cos(x)

And I factored out (cosx-sinx)^2

Then it's just simple algebra to cancel till the 3rd step where we used another identity derived from the Pythagorean Theorem.

cos^2(x)+sin^2(x)=1

That's it!

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2 years ago
Find factors of 40 that will SUBTRACT to 3 <br><br> Smaller factor:<br> Larger factor:
Cloud [144]
8 and 5 multiply to 40 but subtract to 3.
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3 years ago
What is 20% of 20 ?
Mariana [72]

The answer is 4.

The easiest way to determine the value of statements like this is to turn the percentage into a decimal and then multiply.

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6 0
3 years ago
Read 2 more answers
A parking lot covers 32,420 square feet .what id its area to the nearest thousand feet
Mademuasel [1]

Answer: 32,000

Step-by-step explanation:

the thousands place (1000) is the fourth number to the left of the decimal, so round that one either up or down based on the number just one spot closer to the decimal, in this case, the hundreds place (100).

so we have 32,420

we can ignore the numbers that are going to become zeros as a result of the rounding . .

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let's round 32,XXX either up or down based on the value in the hundreds place. if that value is 5 or greater, than we round up. if it is less than 5, than we round down.

4 is in the hundreds place, so we round down

32,000 is the answer

Hope this helps!!! Good luck!!! ;)

6 0
3 years ago
9. Which of the following relations is a function?
elena-14-01-66 [18.8K]
The answer is D because the first number doesn’t reapeat
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