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**jjkins** My teacher gave us a brainteaser for extra points... haha but it's been a long time since i used parabolas... guide me to the solution please!! Thank You guys!

Given equation: h(t)=c-(d-4t)^2

Problem:

At time t=0 a ball was thrown upward from an initial height og 6 feet. Until the ball hit the ground, tis height, in feet, after t secons was given by the function h above, in which d and c are positive constants. If the ball reached its maximum height of 106 feet at time t=2.5, what was the heigh in feet of the ball at time t=1?

Well, I supposed that c=6.. .but that won't make sense when you plug in 2.5 to t.( 6-d^2-100) I am seriously lost.....