The problem
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for absolute value shouldn't the -3 become 3 and then added with the 7 and then multiplied by 49
Answer provided by our tutors
No.
Think of | | as parentheses. You first do everything inside parentheses (so -3+7=4), and then you apply the absolute value (which in this case will not make any difference since "4" is positive.
If you had |-3|+|7|, then your reasoning would apply
Regards
NJ