Answer:
No solution
Step-by-step explanation:
An absolute value equation cannot equal a negative number.
106 is the answer to this question
Answer: In 4 minutes he will make 5 portraits
Step-by-step explanation:

A = b+5
ab = 3300
(b+5)b = 3300
b² +5b -3300 = 0 (quadratic formula)
b=55
a=60 (by first relation)
Answer:
To check if a given value is a solution to an equation:
Evaluate the left-hand side expression at the given value to get a number.
Evaluate the right-hand side expression at the given value to get a number.
See if the numbers match.