Chapter 5.2B, Problem 31A

Lake Mead is at an all-time low water level. The city of Las Vegas draws water from the lake. The pipe that draws the water is just $25\text{feet}$ below the water level and the water drops at the rate of $7\text{}\text{feet}$ every $2\text{years}$. Write this information using integers and calculate how long it will be before the pipe takes in air instead of water.