A cable in the shape of a parabola suspends from bridge towers 90 feet apart and rise 50 feet higher than the road. The halfway point is 3 feet
higher than the road. What is the approximate height of the cable 30 feet
from either tower?

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.