1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
denpristay [2]
3 years ago
12

What is ( - 9)5 ÷ ( - 9)5

Mathematics
2 answers:
wolverine [178]3 years ago
7 0

Answer:

=1

Step-by-step explanation:

( - 9)5 ÷ ( - 9)5

-45/-45

= 1

aleksley [76]3 years ago
3 0

Answer:

the answer is 25

Please give me brainliest

You might be interested in
75 is 25% more than 60, but 60 is 20% less than 75, explain why?
xxMikexx [17]

Answer:

Explanation:

15 goes into 60, 4 times (1 fourth is equal to 25%).

15 goes into 75, 5 times (1 fifth is equal to 20%)

So 75 is one fifth more because it has a value of 15 more, and 60 is 1 fourth less than 75 because its value is more minuscule and less is more.

If you don't understand this was quite the challenge to explain.

4 0
3 years ago
Jennifer bought a printer that cost $240. there was a 7% sales tax on the printer. how much sales tax did jennifer pay?
lilavasa [31]
Divide 7% into $240 dollars and hat should get you your answer.
hope this helps!
5 0
3 years ago
Read 2 more answers
63n^3+54n^2-105n-90<br> Please help me factor by grouping
Zinaida [17]

Answer:3(7n+6)(3n^{2}-5)

Step-by-step explanation:

5 0
2 years ago
Please help with this! Jen is deciding to get a new phone. One deal is a free phone with a two year contract, but she will have
Gnom [1K]
All you have to do is add 399 to 10 and then multiply by ten. Then you get 199 and multiply by .08 and multiply that by ten. Then you subtract.
7 0
3 years ago
A cell phone manufacturer claims that the average battery life of its newest flagship smartphone is exactly 20 hours. Javier bel
adelina 88 [10]

Answer:

(B) Fail to reject the null hypothesis that the true population mean battery life of the smartphone is equal to 20 hours.

(C) There is not enough evidence at the α=0.05 level of significance to suggest that the true population mean battery life of the smartphone is less than 20 hours.

Step-by-step explanation:

1) Data given and notation    

\bar X=19.5 represent the battery life sample mean  

s=1.9 represent the sample standard deviation    

n=33 sample size    

\mu_o =20 represent the value that we want to test  

\alpha=0.05 represent the significance level for the hypothesis test.    

t would represent the statistic (variable of interest)    

p_v represent the p value for the test (variable of interest)    

2) State the null and alternative hypotheses.    

We need to conduct a hypothesis in order to check if the mean battery life is less than 20 :    

Null hypothesis:\mu \geq 20    

Alternative hypothesis:\mu < 20    

Since we don't know the population deviation, is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:    

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}} (1)    

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".    

3) Calculate the statistic    

We can replace in formula (1) the info given like this:    

t=\frac{19.5-20}{\frac{1.9}{\sqrt{33}}}=-1.51    

4) P-value    

First we need to calculate the degrees of freedom given by:

df=n-1=33-1=32

Since is a one-side lower test the p value would be:    

p_v =P(t_{(32)}    

5) Conclusion    

If we compare the p value and the significance level given \alpha=0.05 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the average battery life it's not significantly different less than 20 hours at 5% of signficance. If we analyze the options given we have:

(A) Reject the null hypothesis that the true population mean battery life of the smartphone is equal to 20 hours. FALSE, we FAIL to reject the null hypothesis.

(B) Fail to reject the null hypothesis that the true population mean battery life of the smartphone is equal to 20 hours. TRUE, we fail to reject the null hypothesis that the mean would be 20 or higher .

(C) There is not enough evidence at the α=0.05 level of significance to suggest that the true population mean battery life of the smartphone is less than 20 hours.  TRUE, we FAIL to reject the null hypothesis that the mean is greater or equal to 20 hours, so we reject the alternative hypothesis that the mean is less than 20 hours.

(D) There is enough evidence at the α=0.05 level of significance to support the claim that the true population mean battery life of the smartphone is not equal to 20 hours. FALSE the claim is not that the mean is different from 20. The real claim is: "Javier believes the mean battery life is less than 20 hours".

5 0
3 years ago
Other questions:
  • Given h(x) = 4x + 3, find h(-1).<br> Answer:<br> Answer:<br> I<br> Submit Answer<br> atten
    14·1 answer
  • Help me please!!!!! I need help!!
    6·1 answer
  • A pollen grain is 3/10 to the third power centimeters wide. In an illustration, the pollen grain is 6 centimeters 10 wide. How m
    7·1 answer
  • Would the following situation be better represented by a linear function or an exponential function:
    8·1 answer
  • In a certain​ country, the mean birth weight for boys is 3.27 ​kg, with a standard deviation of 0.51 kg. Assuming that the distr
    11·1 answer
  • 1/3(m-1)=-5<br> Please help
    15·1 answer
  • 6x6x6x6x6x6 15x15x15 Write the product as a power
    8·2 answers
  • 15•(13 - 7) ÷ (8 - 5) Simplify
    11·2 answers
  • Help what’s this answer
    5·1 answer
  • Brooklyn Technical High School surveyed its students about
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!