Suzette opened a CD 10 years ago at an interest rate of 8.2%, compounded semiannually. According to the rule of 72, when did she have half the amount of money that she has now?

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 values of c and d make the equation true?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.