All categories

3 years ago

Please please help me with these 2 questions

Mathematics

1 answer:

Novay_Z [31]3 years ago

6 0

For number 4 the equation is 12 divided by 3/4 and when you solve that you get 16 which is the answer. For question 5 the equation would be 40 5/8 divided by 4. The first to do this is make 40 5/8 an improper fraction which is 325/8. Then you would flip the 4/1(this is the same thing as 4) to get 1/4. Then you would multiply 325/8 * 4 to get 325/32 and as a mixed number 10 5/32 which is the answer.

You might be interested in

war 1 Luz has pound of cherries. She divides the 3 dag int cherries equally into 2 bags. What fraction of pound of cherries is i

irina [24]

Step-by-step explanation:

is the number of unit squares that cover surface of a figure.

8 0

3 years ago

The ratio of girls to boys in the grade is 9 to 10. If there are 225 girls, how many boys are there?

MArishka [77]

Answer:

250 boys

Step-by-step explanation:

We know that the ratio is 9:10 from girls to boys

Take 225 and divide it by 9

225 ÷ 9 = 25

So we know that 25 is a factor of 225

We can the number of boys and multiply it by 25 to get 250

If we put it in the ratio form:

225:250 = 9/10

Check work:

25 x 9 = 225

25 x 10 = 250

5 0

3 years ago

Read 2 more answers

Give some examples of perpendicular lines inside or outside your classroom.

DedPeter [7]

Answer:

Roads that meet at intersections in which create a right angle

Hospital crosses.

Step-by-step explanation:

5 0

3 years ago

Suppose a lawn and garden company wants to determine the current percentage of customers who use fertilizer on their lawns. How

marishachu [46]

Answer:

n=601

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})$

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The confidence interval for the mean is given by the following formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

And on this case we have that $ME =\pm 0.04$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

Since we don't have a prior estimation for the proportion we can use 0.5 as estimation. And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.04}{1.96})^2}=600.25$

And rounded up we have that n=601

3 0

3 years ago

Determine the quadratic inequality that produces the graph below. HELP ASAP!

svetlana [45]

Answer:

<em> believe it's option C but not 100 percent sure.</em>

Step-by-step explanation:

I'm not good at explaining.

4 0

3 years ago