Ex. 1: Suppose you have $20 in your bank account. You start saving $5 each week. Your friend has $5 in his account and is saving $10 each week. After how many weeks will you and your friend have the same amount in your account? How much money will you have? Ex. 2: You have 22 quarters and dimes that total $3.70. Find the number of each coin. Ex. 3: The system below models the cost of taking an aerobics class as a function of the number of classes. Find the solution of the system. What does the solution mean in terms of the situation?
C(a)= 4a
C(a) = 10 + 2a
Homework: Finish word problems and do mixed review.