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1 year ago

Who wants to solve a question.

Mathematics

1 answer:

vovikov84 [41]1 year ago

6 0

Answer:

Step-by-step explanation:

5(p-3)

the 3 lbs she uses are being subtracted and then is being multiplied per lb

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Solve.<br> –51/2 + 63/4 + (-41/4)

VladimirAG [237]

Answer:

-20

Step-by-step explanation:

cause i did the math hope this helped :D

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3 years ago

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3 years ago

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7. A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The T

Anit [1.1K]

Answer:

Modification has not reduced the number of accidents.

Step-by-step explanation:

$H_0: \mu\geq0\\H_a:\mu$

A B C D E F G H

Before modification 5 7 6 4 8 9 8 10

After modification 3 7 7 0 4 6 8 2

Difference -2 0 1 -4 -4 -3 0 -8

Mean of differences $M_d = \frac{sum}{8}=\frac{2+0-1+4+4+3-0+8}{8}=2.5$

Standard deviation of differences = $\sqrt{\frac{\sum(x-\bar{x})^2}{n}}=2.9277$

Formula of paired t test :

$t=\frac{M_d}{\frac{s}{\sqrt{n}}}\\t=\frac{2.5}{\frac{2.9277}{\sqrt{8}}}\\t = 2.4152$

Df = n-1 = 8-1 =7

$t critical = t_{(df, \alpha)}=t_{7,0.01}=2.998$

t critical> t calculated

So, We failed to reject null hypothesis

Hence modification has not reduced the number of accidents.

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3 years ago

Subtract -3n^2 from -7n^2

Sergeeva-Olga [200]

Answer: 4n^2

Step-by-step explanation: -3n^2 - (-7n^2) = -3n^2 + 7n^2= 4n^2. When adding and subtracting the exponents stay the same only the coefficients are subtracted or added

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3 years ago

I’m not an expert at simplifying, so I need help

Rainbow [258]

Answer: it's 1 1/2

please give me brainlest

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3 years ago