The sum of three numbers is 99. the first number is 9 more than the third. the second number is 4 times the third. what are the numbers?

Write an explicit formula that represents the sequence defined by the following recursive formula:

Liam's parents are driving three times as fast as liam is biking, but they left later than he did. if his parents caught up with him two hours after he left, how much later than liam did they leave?

Find an equation of the line perpendicular to the graph.