The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 38 minutes of calls is \$25...

Omar removed 24 fish from his pond over a period of 3 days. He removed the same number of fish each day. What was the change in the number of fish in the pond each day?

Teresa pumped 14 gallons of water out of her pool.This was done over a period of 2 minutes at a constant rate.What was the change in the amount of water in the pool each minute?

The money that Aileen had was a whole number. She wished to buy a guitar but was short of \$110.70. Bob wanted to purchase the same guitar using all his money but was short of \$2.50. If they pooled...

Suppose that a plumbing repair bill, not including tax, was \$140. This included \$25 for parts and an amount for 2 hours of labor. Find the hourly rate that was charged for labor.

a. Yolanda and Yoko ran in a 100-yd dash. When Yolanda crossed the finish line in 15 seconds. Yoko was 10 yards behind her. The girls then repeated the race. With Yolanda starting 10 yards behind...

In the chocolate boxes that Dennis and Mao buy, there is a discount coupon. If you collect 10 coupons, you get a free chocolate bag for free. Dennis says that each such box with a coupon really worth...