Hassan predicted that he would sell 178 postcards. He actually sold 142 postcards. What are the values of A and b in the given table? Percent Error Item Approximate value Exact value Error Absolute error Ratio Percent error Postcards 178 142 A b
Answer
A
A is equal to 36 ; b is equal to negative 36
B
A is equal to negative 36 ; b is equal to 36
C
A is equal to 36 ; b is equal to 36
D
A is equal to negative 36 ; b is equal to negative 36
Explanation
Error is the approximate value minus the exact value: 178 − 142 = 36, so A = 36. Absolute error is the distance between the two values, so it is |36| = 36; therefore b = 36. Choice C gives A = 36 and b = 36.
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