After 1 second, the ball is 121 feet in the air; after 2 seconds, the ball is 224 feet in the air. Find the height, in feet, of the ball after 3 seconds in the air. use the quadratic function to solve.

Question

anonymous · Answer

I think you should indicate if there is initial velocity or not.

anonymous · Answer

The ball was launched  from a sling shot. that's all i know.

anonymous · Answer

Sorry my stupid let me try to solve...

anonymous · Answer

it's okay. :b

anonymous · Answer

$$V0*t-1/2*g*t ^{2}$$
V0*1-1/2*g*1=121
v0*2-1/2*g*4=224
After the solving equation , 
i found V0=130 feet/s , and g=18 feet/s^2
130*3-1/2*18*9=309 feet ,

anonymous · Answer

thanks! 
would you be interested in helping me with the last 3?

anonymous · Answer

If i can , but what you mean with last 3 ?

anonymous · Answer

i have 3 questions left.

anonymous · Answer

Ahh Okay (: i will try ... shoot!

anonymous · Answer

The company discovered that it costs $37 to produce 3 calculators, $213 to produce 7, $658 to produce 12. Using the quadratic function, find the cost of producing 8 calculators.

anonymous · Answer

Sorry i couldn't solve it. :/

anonymous · Answer

it's okay
thanks though