All categories

2 years ago

-5a to the second power-7a

Mathematics

1 answer:

kakasveta [241]2 years ago

7 0

-5a^2 - 7a = -a x (5a + 7)
let me know if you have any other questions
:)

You might be interested in

Add my s.n.a.p clown6941

mina [271]

Answer:

lol

Step-by-step explanation:

3 0

1 year ago

Convert 3miles in feet

Kaylis [27]

15,840 Feet .........

6 0

2 years ago

Read 2 more answers

madreJ [45]

Answer:

Step-by-step explanation:An ice machine uses 3 gallons of water every 9 hours. How many gallons of water does it use each hour? How many

hours does it take to use one gallon?

gallon per hour, 1 hour

gallon per hour, 3 hours

3 gallons per hour, 5 hour

gallon per hour,

1 hour

6 0

2 years ago

What 1,500 rounded to the nearest hundredth

Tcecarenko [31]

Answer:

2,000

Step-by-step explanation:

4 0

2 years ago

Read 2 more answers

Ten engineering schools in the United States were surveyed. The sample contained 250 electrical engineers, 80 being women; 175 c

steposvetlana [31]

Answer:

There is a significant difference between the two proportions.

Step-by-step explanation:

The (1 - α)% confidence interval for difference between population proportions is:

$CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha/2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}$

Compute the sample proportions as follows:

$\hat p_{1}=\frac{80}{250}=0.32\\\\\hat p_{2}=\frac{40}{175}=0.23$

The critical value of z for 90% confidence interval is:

$z_{0.10/2}=z_{0.05}=1.645$

Compute a 90% confidence interval for the difference between the proportions of women in these two fields of engineering as follows:

$CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha/2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}$

$=(0.32-0.23)\pm 1.645\times\sqrt{\frac{0.32(1-0.32)}{250}+\frac{0.23(1-0.23)}{175}}\\\\=0.09\pm 0.0714\\\\=(0.0186, 0.1614)\\\\\approx (0.02, 0.16)$

There will be no difference between the two proportions if the 90% confidence interval consists of 0.

But the 90% confidence interval does not consists of 0.

Thus, there is a significant difference between the two proportions.

4 0

2 years ago