Which number line represents all of the values of x for the equation x^2=16

If an athlete can bike 6 miles in 25 minutes, how many miles will he bike in an hour and half if he continues to bike at the same rate?

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?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?