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3 years ago

Round 444 to the nearest hundred

2 answers:

7 0

That would be 400. Think of it like having your hands on a balloon, where the number directly to the right of the number you are rounding is the number of fingers NOT touching the balloon. With 1 finger gone, it stays DOWN, showing the number rounding down. The same goes for 2 fingers, 3 fingers, and four fingers. After taking 5 fingers or more off, however, it will go UP, showing the number rounding up.

Sindrei [870]3 years ago

5 0

400
is your answer because 444 if its above 450 then ts 500 but since its below 450 is 400

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I don't know how to do this it is hard

Solnce55 [7]

(-4) means that it would be +4

3 0

3 years ago

Researchers are investigating the effectiveness of leg-strength training on cycling performance. A sample of 7 men will be selec

ruslelena [56]

Answer:

A. The interval will be narrower if 15 men are used in the sample.

Step-by-step explanation:

Hello!

When all other things remain the same, which of the following statements about the width of the interval is correct?

A. The interval will be narrower if 15 men are used in the sample.

B. The interval will be wider if 15 men are used in the sample.

C. The interval will be narrower if 5 men are used in the sample.

D. The interval will be narrower if the level is increased to 99% confidence.

E. The interval will be wider if the level is decreased to 90% confidence.

Consider that the variable of interest "Xd: Difference between the peak power of a cyclist before training and after training" has a normal distribution. To construct the confidence interval for the population mean of the difference you have to use a pooled t-test.

The general structure for the CI is "point estimate"±" margin fo error"

Any modification to the sample size, sample variance and/or the confidence level affect the length of the interval (amplitude) and the margin of error (semiamplitude)

The margin of error of the interval is:

d= $t_{n-1;1-\alpha /2}$ * (Sd/n)

1) The sample size changes, all other terms of the interval stay the same.

As you can see the margin of error and the sample size (n) have an indirect relationship. This means, that when the sample size increases, the semiamplitude decreases, and when the sample size decreases, the semiamplitude increases.

↓d= $t_{n-1;1-\alpha /2}$ * (Sd/↑n)

↑d= $t_{n-1;1-\alpha /2}$ * (Sd/↓n)

Correct option: A. The interval will be narrower if 15 men are used in the sample.

2) The confidence level has a direct relationship with the semiamplitude of the interval, this means that when the confidence level increases, so do the semiamplitude, and if the level decreases, so do the semiamplitude:

↓d= ↓ $t_{n-1;1-\alpha /2}$ * (Sd/n)

↑d= ↑ $t_{n-1;1-\alpha /2}$ * (Sd/n)

I hope it helps!

4 0

3 years ago

Please help me with the question please ASAP

erica [24]

Answer:

The ratio of perimeter of ABCD to perimeter of WXYZ = $\frac{2}{3}$

Step-by-step explanation:

First, we have to determine the multiplicative factor of the dimensions for both figures.

Considering sides AB and WX,

multiplicative factor = $\frac{12}{8}$

= 1.5

So that:

XY = 6 x 1.5 = 9

YZ = 7 x 1.5 = 10.5

ZW = 7 x 1.5 = 10.5

Perimeter of ABCD = 6 + 7 + 7 + 8

= 28

Perimeter of WXYZ = 9 + 10.5 + 10.5 + 12

= 42

The ratio of the perimeters of the two quadrilaterals can be determined as;

ratio = $\frac{perimeter of ABCD}{Perirmeter of WXYZ}$

= $\frac{28}{42}$

= $\frac{2}{3}$

The ratio of the perimeter of ABCD to perimeter of WXYZ is $\frac{2}{3}$ .

5 0

3 years ago

The length of a rectangle is five times its width.

Vera_Pavlovna [14]

Answer:

Step-by-step explanation:

l = 5w

A = l*w

180 = 5w *w

180 = 5w^2

Divide each side by 5

180/5 = 5w^2 /5

36 = w^2

Taking the square root of each side

sqrt(36) = sqrt(w)^2

6 =w

l = 5w = 5*6 = 30

The perimeter is

P = 2(l+w)

P = 2(6+30) = 2(36) = 72

4 0

3 years ago

10. Explain why log328 is between 3 and 4.

maw [93]

Answer:

See explanation.

(Before continuing reading, I took the base to be 3. Please tell me if you didn't want the base to be 3.)

Step-by-step explanation:

I assume 3 is suppose to be the base. Let's list some values that can be written as 3 to some integer.

3^0=1

3^1=3

3^2=9

3^3=27

3^4=81

3^5=243

......

I could have also did negative integer powers, but this is all I really need to convince you that log_3(28) is between 3 and 4.

log_3(28) means the value x such that 3^x=28.

Since 28 is between 27 and 81 in my list above, that means 3^x is between 3^3 and 3^4. This means that x is a value between 3 and 4.

8 0

3 years ago