9) Andrew scored a 95 on his last test and the only question he answered incorrectly is listed below.
Answer the following questions 9(a) and 9(b) as they relate to Andrew’s work.
(a) Read through the question and Andrew’s work. (b) Explain what he did wrong and what he should
Find and circle his mistake.
have done.
Evaluate: 3(r + 2) (4-r) when r = 1.
Andrew’s work:
= 3(r + 2)(4-r)
= 3(1+2)(4-1)
= 3(3)(3)
= 9