If working together, brothers tom and jack can paint a wall in 4 hours, how much time would it take jack to paint the wall alone? (1) jack is painting twice as fast as tom. (2) if tom painted twice as fast as he actually does, the brothers would finish the work in 3 hours.

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

How many $20 bills do you need to have to make $280