Hassan predicted that he would sell 178 postcards. He actually sold 142 postcards. What are the values of a and b in the table below?

Percent Error

Item:POSTCARDS

Approximate value:178

Exact value:142

Error:A

Absolute error:B

Ratio

Percent error

answer choices
(A )a = negative 36; b = negative 36
(B)a = negative 36; b = 36
(C)a = 36; b = negative 36
(D)a = 36; b = 36

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3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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