Suggested window: xmin = -1 xmax = 6 and ymin = -10 ymax = 140
A soccer ball kicked will reach heighth feet after t seconds, as estimated by the formula h=2 + 90t - 1612
At what time does the soccer ball reach its maximum height?

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secant-secant formula:

(whole secant) x (external part) =           (whole secant) x (external part)

(8+y-2) *8=                                           (y+4+6) *6

(y+6)*8 = (y+10) *6

distribute

8y+48 = 6y +60

subtract 6y from each side

2y +48 = 60

subtract 48 from each side

2y = 12

divide by 2

y = 6

sv =     (y+4+6)

sv   = 6+4+6

sv = 16