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Alborosie
3 years ago
12

HELP ME!! plz? Combing like terms.

Mathematics
1 answer:
Bad White [126]3 years ago
5 0

T: 8x+19

7x-2(4-2x)+6(5-x)-x+2-(6x+5) = 7x-8+2x+30+6x-x+2-6x-5 = 8x+19

Y: 56-8x

9-(-2-3x)+4(-x+6)-x+12-3(2x-3) = 9+2+3x-4x+24-x+12-6x+9 = 56-8x

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kifflom [539]
Methods for solving a system of equations:
- elimination
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Ranks of method ( number one being the most preferred method)
1) elimination
2) substitution
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Elimination is my preferred method because it is simple and easy to work out and hard to get wrong.


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6 0
3 years ago
A building is constructed using bricks that can be modeled as right rectangular prisms with a dimension of 7\frac{3}{4}7
Neko [114]

The cost of 800 bricks having dimensions of 7\frac{3}{4} \ by\  3\frac{1}{2} \ by \ 2\frac{1}{2} at a cost of $0.07 per in.³ is <u>$3,797.5</u>

<h3>How can the cost of 800 bricks to be used for the building be found?</h3>

The dimensions of the brick are;

\mathbf{7\frac{3}{4} \ by\  3\frac{1}{2} \ by \ 2\frac{1}{2}}

Cost of a cubic inch of brick = $0.07

The volume of 1 brick is therefore;

Volume \ of  \ 1 \ brick \ V_1= 7\frac{3}{4} \ \times \  3\frac{1}{2} \ \times  \ 2\frac{1}{2} = \mathbf{67\frac{13}{16}}

The volume occupied by 800 bricks is therefore;

Volume \ of  \ 800 \ bricks \ V_{800} = 67\frac{13}{16} \times 800 =\mathbf{ 54250}

Given that the dimensions of the bricks are in inches, the volume of 800 bricks is therefore;

V₈₀₀ = 54,250 in.³

The cost of 800 bricks is therefore;

Total cost = 54,250 in.³ × $0.07 = $3,797.5

The cost of 800 bricks is <u>$3,797.5</u>

Learn more about finding the volume of a rectangular prism here:

brainly.com/question/3789826

7 0
2 years ago
Increasing and decreasing intervals
scoray [572]

Answer:

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Step-by-step explanation:

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is there more to this? if so i would love to help.

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