WRITE YES IF THE EQUATION IS RIGHT AND NO IF ITS WRONG PLS!

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.

The volume of the a sphere whoes diameter is 18 cm is cubic cm . if it's diameter were reduced by half, it's volume would be of its original volume

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?