<p>ok, here are two math problems that I could not get correct... dont know why.

The acme plumbing company will send a team of 3 plumbers to work on a certain job. The company has 4 experienced plumbers and 4 trainees. If a team consists of 1 experienced plumber and 2 trainees, how many different such teams are possible.

I keep getting: 4x4x3=48... but the answer is 24</p>

<p>Also, at time t=0, a ball is thrown upwards from an initial height of 6 feet. Until the ball hit the ground, its height, in feet, after t seconds was given by the function h (h=c-(d-4t)^2) in which c and d are positive constants. If the ball reached its max height of 106 feet at time t=2.5 seconds, what was the height, in feet, of the ball at time t=1.

Thanks guys!</p>