Question

Myra is evaluating the expression –31.7 + 4.5x, when x = 2.1. –31.7 + 4.5(2.1) –27.2(2.1) –57.12 What was Myra’s error?

Answer 1

a negative and a positive

Explanation:

always equal a negative

and she put x next to 31.7 when x was not meant to be there

Answer 2

She added before multiplying instead of multiplying before adding

Explanation:

–31.7 + 4.5x

Let x=2.1

–31.7 + 4.5(2.1)

We multiply before adding

-31.7 +9.45

-22.25