Answer:
7
Step-by-step explanation:
9x+18=2x+19 (corresponding angle)
or, 9x-2x=19-18
or, 7x=1
or, x= 7
I believe it’s -6 square root of 2 + 3 square root of 4 + 6 square root of 5
Answer: The required average is $576.
Step-by-step explanation:
Since we have given that
Percent of customers not returning each year = 25%
Average customer lifetime = 
Percent of margin on the average bill = 60%
Cost per visit = $12
Number of times each year visited = 20 times
So, Average expense by each customer per year = 
Average margin = 60% of 240 = 
Average non discounted gross profit during a customer's lifetime is given by

Hence, the required average is $576.