Answer:
Step-by-step explanation:
(1). Maryam's answer is correct.
(2). x = 2
The mistake is line 4, she should have divided 42 by 5, not add 5 and 16
Answer:

Step-by-step explanation:
multiple the top exponents by 3 and the u subtract the bottoms
Answer:45 degrees
Step-by-step explanation:
360/8 sides =45