Homework Help: Algebra; Help immediately.

Posted by Marilyn on Thursday, May 24, 2012 at 10:38pm.

The height of a ball that was batted into the air at 160 feet per second is a function of t, the time in seconds after the ball was hit. The height is determined by subtracting 16 times the square of t from 160 times t. Which equation can be used to find t when the ball is 400 feet high?
A. 160t-16t^2=400
B. (160-16)t^2=400
C. 160(t^2-t)=400
D. 160-(16-t^2)=400
E. 16t^2-160t=400

Algebra; Help immediately. - Bosnian, Thursday, May 24, 2012 at 10:45pm
h = height

t = time

h = 160 t - 16 t ^ 2

400 = 160 t - 16 t ^ 23

160 t - 16 t ^ 23 = 400
Algebra; Help immediately. - Marilyn, Thursday, May 24, 2012 at 10:47pm
Uh..so what's the answer? I don't understand..
Algebra; Help immediately. - Bosnian, Thursday, May 24, 2012 at 10:57pm
Sorry my tipfeler.

Answer is A

h = 160 t - 16 t ^ 2

400 = 160 t - 16 t ^ 2

160 t - 16 t ^ 2 = 400

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