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Paladinen [302]
2 years ago
13

B ÷ -2 =5 will it be negative or positive

Mathematics
2 answers:
JulijaS [17]2 years ago
7 0

Answer:

the answer is negative

Step-by-step explanation:

Im pretty sure it is since negative and negative I'd positive

Reil [10]2 years ago
5 0
The answer is positive final answer
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A laptop producing company also produces laptop batteries, and claims that the batteries
gregori [183]

Answer:

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours. (P-value = 0).

The null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

Step-by-step explanation:

<em>The question is incomplete: To test this claim a sample or population standard deviation is needed.</em>

<em>We will estimate that the sample standard deviation is 2 hours, and use a t-test to test that claim.</em>

<em> NOTE (after solving): The difference between the sample mean and the mean of the null hypothesis is big enough to reject the null hypothesis, even when we have a sample standard deviation of 3.5 hours, which can be considered bigger than the maximum standard deviation for the sample.</em>

This is a hypothesis test for the population mean.

The claim is that the batteries power the laptops for significantly less than 4 hours.

Then, the null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

The significance level is 0.05.

The sample has a size n=500.

The sample mean is M=3.5.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=2.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{2}{\sqrt{500}}=0.0894

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{3.5-4}{0.0894}=\dfrac{-0.5}{0.0894}=-5.5902

The degrees of freedom for this sample size are:

df=n-1=500-1=499

This test is a left-tailed test, with 499 degrees of freedom and t=-5.5902, so the P-value for this test is calculated as (using a t-table):

P-value=P(t

As the P-value (0) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours.

5 0
3 years ago
In simplified exponential notation, the expression a²·a -3·a=<br><br> A 1/a<br> B 0<br> C 1
dalvyx [7]
Answer a^3-3a

a^2 times a = a^3 you add exponents
4 0
3 years ago
Read 2 more answers
A slope of −3, passing through the point (15,−50).
Sauron [17]

Answer:

you would first put a point at (15, -50) then go down 3 places then go down 1 place,

Step-by-step explanation: when a slop is just a number, always put a 1 under it

3 0
3 years ago
Read 2 more answers
I AM GIVING 35 POINTS TO WHOMEVER ANSWERS THIS!!!!
GuDViN [60]

Answer:

I believe the answer is D, but I'm not entirely sure.

Step-by-step explanation:

The Pythagorean theorem is A squared times B squared equals C squared. So your closest statement is D.

Let me know if I'm wrong

3 0
3 years ago
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Lance baked a pie Justin ate 2/3 of the pie and Joey ate 1/4 of the pie how much of the pie is left
zepelin [54]
1 - 2/3 - 1/4
= 1 - 8/12 - 3/12
= 1/12
8 0
2 years ago
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