Answer:
C. Justin should have multiplied 3.8 and 7.9 first.
Step-by-step explanation:
Justin's error was in his first step when he didn't multiply 3.8 by 7.9 first.
To explain this more, here are the correct steps:
Expression:
12.5 + 3/8x (When x = 7.9)
1. 12.5 + (3.8x x 7.9)
2. 12.5 + 30.02
3. 12.5 + 30.02 = 42.52
Therefore, C. is your correct answer.
