Ne tried to evaluate an expression. Here is her work: 10 - 4 + 2(4)
= 10 - 4 + 8?
Step 1
Time
elapse
= 10 - 4 + 64
Step 2
8.
00
= 6 + 64
Step 3
SmartSc
out of 100
= 70
Step 4
Is Justine's work correct?
30
No, Justine made a mistake going from the given expression to Step 1.
Justine should have squared 4 before multiplying. The order of operations
says to evaluate exponents before you multiply.
No, Justine made a mistake going from Step 2 to Step 3. Justine should have
added before she subtracted. The order of operations says to add before you
subtract.
Yes, Justine's work is correct.