What is the constant of proportionality in the equation y=2.5 times x? this is a khan academy question.

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?

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

What is the absolute value of the complex number -4-sqrt2i