Help ASAP 15 points
A 20cm
B 15cm
C 12
D 17

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.