PLZ HELP ME WITH THIS ITS DUE SOON AND IDK HOW TO DO IT :(

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?

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

Solve the following: 12(x^2–x–1)+13(x^2–x–1)=25(x^2–x–1) 364x–64x=300x