Q8
1 answer:
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Answer:
<h2>8. D) 2x + 8</h2><h2>9. C) 6x + 32 = 158</h2><h2>10. 50 ft</h2>Step-by-step explanation:
Look at the picture.
9. The perimeter of the rectangle l × w:
P = 2l + 2w
Substitute l = 2x + 8 and w = x + 8:
P = 2(2x + 8) + 2(x + 8) <em>use the distributive property</em>
P = (2)(2x) + (2)(8) + (2)(x) + (2)(8)
P = 4x + 16 + 2x + 16 <em>combine like terms</em>
P = (4x + 2x) + (16 + 16)
P = 6x + 32
10. Solve the equation:
6x + 32 = 158 <em>subtract 32 from both sides</em>
6x = 126 <em>divide both sides by 6</em>
x = 21
Put the value of x to the expression 2x + 8:
2(21) + 8 = 42 + 8 = 50
