All categories

3 years ago

Can someone please help me??

Mathematics

2 answers:

Anna [14]3 years ago

7 0

Answer:

1) D.

2) A

Step-by-step Explanation:

1) $7^{-2}$

= $(\frac{1}{7})^2$

2) $(\frac{2}{3})^{-3}$

= $(\frac{3}{2})^{3}$

prisoha [69]3 years ago

5 0

Answer:

Step-by-step explanation:

$a^{-m}=(\frac{1}{a})^{m}\\\\\\1)7^{-2}=(\frac{1}{7})^{2}\\\\\\2)(\frac{2}{3})^{-3}=(\frac{1}{\frac{2}{3}})^{3}\\\\=(\frac{3}{2})^{3}$

You might be interested in

I need help with this

pochemuha

Answer:

$A(x) = \frac{ 4x + 800 }{x}$

Step-by-step explanation:

$C(x) = 4x + 800.... (given)$

$\because \: A(x) = \frac{C(x) }{x}$

$\therefore \: A(x) = \frac{ 4x + 800 }{x}$

7 0

3 years ago

PLEASEEEEEE HELPPPP

Ne4ueva [31]

This is just like an exponential growth equation...

Final=initial*rate^periods

25000=12500(1.0525)^t

2=1.0525^t

ln2=t ln1.0525

t=ln2/ln1.0525

t=13.55

t=14 yrs

4 0

4 years ago

Read 2 more answers

A basketball player made 50 baskets in a season. Of these, 36% were three-point shots. How many three-point shots did the player

kobusy [5.1K]

Answer: 18

Explanation: 50x.36= 18

3 0

3 years ago

Please HELP!<br> How do I factorise 2x^2 - 11x -6x <br> please include working <br> Thanks!

Harrizon [31]

Answer:

x(2x-17)

Step-by-step explanation:

2x^2 -11x-6x

2x^2-17x

x is common

x(2x-17)

6 0

3 years ago

Read 2 more answers

The CEO of a large electric utility claims that more than 75 percent of his customers are very satisfied with the service they r

vichka [17]

Answer:

$z=\frac{0.77-0.75}{\sqrt{\frac{0.75(1-0.75)}{100}}}=0.462$

Now we can find the p value using the alternative hypothesis with this probability:

$p_v =P(z>0.462)=0.322$

Since the p value is large enough, we have evidence to conclude that the true proportion for this case is NOT significanctly higher than 0.75 since we FAIL to reject the null hypothesis at any significance level lower than 30%

Step-by-step explanation:

Information provided

n=100 represent the random sample selected

$\hat p=0.77$ estimated proportion of students that are satisfied

is the value that we want to test

z would represent the statistic

$p_v$ represent the p value

System of hypothesis

We want to verify if more than 75 percent of his customers are very satisfied with the service they receive, then the system of hypothesis is.:

Null hypothesis: $p\leq 0.75$

Alternative hypothesis: $p > 0.75$

The statistic is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

Replacing the info given we got:

$z=\frac{0.77-0.75}{\sqrt{\frac{0.75(1-0.75)}{100}}}=0.462$

Now we can find the p value using the alternative hypothesis with this probability:

$p_v =P(z>0.462)=0.322$

Since the p value is large enough we have evidence to conclude that the true proportion for this case is NOT significanctly higher than 0.75 since we FAIL to reject the null hypothesis at any significance level lower than 30%

4 0

3 years ago