David worked 13 more hours than Jen. If David worked 9 hours for every 4 hours Jan worked, how long did they each work?

If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? use the equation h = −16t2 + 64t + 4.

Which number line represents the solution set for the inequality - x 24?

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.