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allsm [11]
3 years ago
8

PLZZZZ HELP ME PLZZZZZZZ

Mathematics
2 answers:
myrzilka [38]3 years ago
5 0
-2x + 16 = x + 28
-12 = 3x
X = -4
forsale [732]3 years ago
5 0
1) expand

-2+16=x+28

2) add 2x to both sides

16=x+28+2x

3) simplify x+28+2x to 3x+28

16=3x+28

4) subtract 28 from both sides

16-28=3x

5) simplify 16-28 to -12

-12=3x

6) divide both sides by 3

-12/3=x

7) simplify 12/3 to 4

-4=x

8) switch sides

x=-4
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Answer:

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Step-by-step explanation:

The parameters of the steel pad and the scale model are;

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The dimensions of the model of the same material = 6 feet by 4.5 feet and 4.5 inches thick

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The dimensions of the sample in yards are;

6 feet = 2 yards, 4.5 feet = 1.5 yards, and 4 inches = 0.\overline 1 yards

The volume of the sample, V₂ = 2 yd. × 1.5 yd. × 0.\overline 1 yd. =  (1/3) yd.³

The density of the sample material, ρ = m₂/V₂

∴ The density of the sample material, ρ = 75 lbs/((1/3)yd.³) = 225 lbs/yd³

Therefore, the density of the material of the pad, ρ = 225 lbs/yd³

The mass of the steel  pad, m₁ = ρ × V₁

∴ The mass of the steel  pad, m₁ = 225 lbs/yd³ × 18 yd³ = 4,050 lbs

The cost of the material for the full-sized steel pad, C = m₁ × P

∴ C = 4,050 lbs × $55/lb = $222,750

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