How many two digit positive integers can be formed from the digits 1, 3, 5, and 9, if no digit is repeated?

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?

What is the logarithmic function modeled by the following table? x f(x) 9 2 27 3 81 4

Write as a product: ac^2–ad+c^3–cd–bc^2+bd