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3 years ago

Help please. and if you can, explain.

Mathematics

2 answers:

Vladimir [108]3 years ago

8 0

Answer:

2400

Step-by-step explanation:

harkovskaia [24]3 years ago

5 0

Answer:

I am saying 10ft

Step-by-step explanation:

Hope this helps.

btw can't explain sorry.

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Heyy!! Can someone help me please!!

abruzzese [7]

Answer:

7x + 14

Step-by-step explanation:

the first thing to do is expand the parentheses/brackets.

3(5x + 2) -2(4x - 4) will be

3(5x) + 3(2) -2(4x) -2(-4)

= 15x + 6 - 8x + 8

collect like terms

15x - 8x + 6 + 8 = 7x + 14

the answer is 7x + 14

5 0

3 years ago

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A farmer ploughts his lands in 12 days if he use 5 tractors ow long will it if he uses 3 tractors?

saul85 [17]

Answer:

Step-by-step explanation:

By proportion it will be (5/3) * 12

= 60/3

= 20 days.

4 0

3 years ago

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Which equation represents the proportional relationship in the table?

Murrr4er [49]

C=3r or r=3c hope it helps

6 0

3 years ago

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If jamie completed 5 chores, about how much money did she earn?

QveST [7]

Answer:

5(chore payment)

Step-by-step explanation:

since we dont know how much money the chore is worth it would be 5 times the money

4 0

2 years ago

A professor records the difference between the marks scored by the students in the class test last week and those scored in the

dezoksy [38]

Answer: $(10.82\ , 13.18)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\mu\pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size : n= 35 , large sample (n>30)

Mean difference : $\overline{x}=12$

Standard deviation : $\sigma=3$

Significance level : $\alpha=- 1-0.999=0.001$

Critical value : $z_{\alpha/2}=z_{0.0005}=3.4807567$

Now, the 99.9% confidence interval for the mean difference between the marks scored last week and marks scored this week by all the students will be :-

$12\pm\ (3.4807567)\dfrac{2}{\sqrt{35}}\\\\=12\pm1.18\\\\=(10.82\ , 13.18)$

Hence, the 99.9% confidence interval for the mean difference between the marks scored last week and marks scored this week by all the students = $(10.82\ , 13.18)$

4 0

3 years ago