Water is leaking from a tank. after t minutes the volume of the water in the tank is 16(200-9t) milliliters. what is the volume of water left in the tank after 18 minutes?

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

The ratio of the ages (in years) of three children is 2: 4: 5. the sum of their ages is 33. what is the age of each child?

In chemistry,n molecules of an ideal gas have pressure, volume, and tempersture that stand inthe following relation, where r is constant. solve the equation for n,the number of molecules. pv=nrt