Answer:
Part A:
Jillian's error was that they added the 7 and the 3 to get 10 and then multiplied by 16. Jillian should have multiplied the 3 and the 16 first and then added 7. This is because multiplication comes before addition in PEMDAS.
Part B:
7+3×(10-6)^2
7+3×(4)^2
7+3×16
7+48
55
Explanation:
PEMDAS