Answer:
The fifth line contains the error.
Step-by-step explanation:
Line 1 is the equation.
Lines 2, 3, and 4 are correct.
The error is in the 5th line.
The square root of a negative number is not a real number, so if this problem is solved only with real numbers, there is no solution.
If imaginary numbers are allowed, then the last line should read:
Answer:
24 customers will not use coupons.
Step-by-step explanation:
Number of customers who use coupons = 9
Number of customers who don't use coupons = x
Ratio of customers who use coupons to customers who don't use coupons = 6:16
24 customers will not use coupons.