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mihalych1998 [28]
3 years ago
15

Simplify: (-7a - 19c) - (-12a + 30c) - (-21a - 11c)

Mathematics
2 answers:
JulijaS [17]3 years ago
8 0
<span>(-7a - 19c) - (-12a + 30c) - (-21a - 11c)
Rewrite with understood 1's:
</span><span>1(-7a - 19c) - 1(-12a + 30c) - 1(-21a - 11c)
Distribute 1's to the terms:
-7a - 19c + 12a - 30c + 21a + 11c
Combine like terms.
26a - 38c </span>
Maurinko [17]3 years ago
6 0
It is D hope that helps
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The blueprint for a new swimming pool uses the scale 3/4 inch = 2 feet. If the actual dimensions of the pool will be 8 ft wide b
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Answer:

The dimensions of the pool on the blueprint would be 3 in wide by 4.5 in long.

Step-by-step explanation:

First I turned 3/4 into a decimal, which would be 0.75. The I divided the dimensions of the pool by two. This way I could multiply the .75 by how many sets of two feet there were in the dimensions. Finally I multiplied 4 by .75 and I multiplied 6 by .75. That is how I found my answer.

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3 years ago
What is the value of x?
SOVA2 [1]

Answer:

x= 32

Step-by-step explanation:

if x+4x-20 = 180

  5x=160

    <u>x=32</u>

3 0
3 years ago
Subtract 6x^2-x+3 from 8x^2-7x-2​
daser333 [38]

Answer:

Step-by-step explanation:

1) translate the given informations in a operation

8x^2 -7x - 2 - (6x^2-x+3)

2) change the sign of all the terms in the bracket

8x^2 -7x -2 -6x^2 + x -3

3) simplify the expression

2x^2 - 6x -5

3 0
3 years ago
The number of electrical outages in a city varies from day to day. Assume that the number of electrical outages ( x ) in the cit
forsale [732]

Answer:

Therefore, the mean and the standard deviation for the number of electrical outages (respectively) are 0.26 and 0.5765 respectively.

Step-by-step explanation:

Given the probability distribution table below:

\left|\begin{array}{c|cccc}x&0&1&2&3\\P(x)&0.8&0.15&0.04&0.01\end{array}\right|

(a)Mean

Expected Value, \mu =\sum x_iP(x_i)

=(0*0.8)+(1*0.15)+(2*0.04)+(3*0.01)

=0+0.15+0.08+0.03

Mean=0.26

(b)Standard Deviation

(x-\mu)^2\\(0-0.26)^2=0.0676\\(1-0.26)^2=0.5476\\(2-0.26)^2=3.0276\\(3-0.26)^2=7.5076

Standard Deviation =\sqrt{\sum (x-\mu)^2P(x)}

=\sqrt{0.0676*0.8+0.5476*0.15+3.0276*0.04+7.5076*0.01}\\=\sqrt{0.3324}\\=0.5765

Therefore, the mean and the standard deviation for the number of electrical outages (respectively) are 0.26 and 0.5765 respectively.

3 0
3 years ago
HELP ME PLEASE I'M GIVING OUT BRAINLIEST WHOEVER ANSWERS FIRST!!!!!
Ad libitum [116K]

Answer:

w=v/ih

Step-by-step explanation:

v=iwh

v/ih=iwh/ih

=w=v/ih

6 0
3 years ago
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