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chubhunter [2.5K]
2 years ago
9

10 POINTS 8TH GRADE MIDDLE SCHOOL MATH

Mathematics
1 answer:
Dominik [7]2 years ago
7 0

Answer:

first one is the answer to this

Step-by-step explanation:

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Use integration by parts to find the integrals in Exercise.<br> ∫xex dx.
Y_Kistochka [10]

Answer:

xe^{x} - e^{x} +C

Step-by-step explanation:

using the formular for integration by parts;

∫udv = uv -∫vdu   ..............equ 1

in the equation below;

∫xe^{x}

u=x , dv =e^{x}

du= 1  v= e^{x}

Substitute into equ 1

∫udv = xe^{x} - ∫e^{x}dx

∫udv = xe^{x} - e^{x} + C

4 0
3 years ago
If 2580 people watched one show and 2920 people watched another show. How many people need to watch the third show for there to
Leokris [45]

Answer:

340

Step-by-step explanation:

2920 - 2580 = 340

There need to be 340 people to watch the third show.

8 0
3 years ago
Read 2 more answers
If 60% of the students in your class like Burger King, how many students are in your class if 15 students like Burger King?
zloy xaker [14]

Answer:

25

Step-by-step explanation:

Let x be the number of students in the class

15 is 60% of x

60% of x can be written as 0.6x

15 = 0.6x

Divide by 0.6 on both sides

25 = x

There are 25 students in the class

Hope this helps :)

8 0
2 years ago
Find the gcf of each pair of monomials <br> 6x2 and 5x2
aleksandrvk [35]

Answer:

its 2  

Step-by-step explanation:

so 6x2 is 12 and 5x2 is 10

u have to find the gcf of 12 and 10 which is 2 :)

8 0
2 years ago
A counselor at a community college claims that the mean GPA for students who have transferred to State University is more than 3
Lena [83]

Answer:

t=\frac{3.25-3.1}{\frac{0.3}{\sqrt{36}}}=3  

If we compare the p value and the significance level for example \alpha=1-0.99=0.01 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis.

And the best conclusion would be:

a) Yes. The counselor's claim is valid

Because we reject the null hypothesis in favor to the alternative hypothesis.

Step-by-step explanation:

Data given and notation  

\bar X=3.25 represent the sample mean

s=0.3 represent the sample standard deviation

n=36 sample size  

\mu_o =3.1 represent the value that we want to test  

\alpha 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)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is more than 3.1, the system of hypothesis would be:  

Null hypothesis:\mu \leq 3.1  

Alternative hypothesis:\mu > 3.1  

If we analyze the size for the sample is < 30 and we don't know the population deviation so 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".  

Calculate the statistic  

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

t=\frac{3.25-3.1}{\frac{0.3}{\sqrt{36}}}=3  

P-value  

The first step is calculate the degrees of freedom, on this case:  

df=n-1=36-1=35  

Since is a one right tailed test the p value would be:  

p_v =P(t_{(35)}>3)=0.00247  

Conclusion  

If we compare the p value and the significance level for example \alpha=1-0.99=0.01 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis.

And the best conclusion would be:

a) Yes. The counselor's claim is valid

Because we reject the null hypothesis in favor to the alternative hypothesis.

5 0
3 years ago
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