Posted by Annie on Thursday, December 8, 2011 at 3:46am.
Sarah throws rocks into a quarry lake from the top of a 67 foot high wall. The chart gives the horizontal distance, x (in feet), the rock has travled from Sarah and the height, y (in feet), of the rock above the lake.
The chart is:
distance, x:9 19 3650
height, y: 75.3981.1082.0774.61
I think the answer is possibly y=0.019x^2+1.10x+67, but I am not sure. Could someone help me please?

Math  Damon, Thursday, December 8, 2011 at 4:41am
well, you are correct that we have a parabola here of form a x^2 + b x + c
since you just asked me to check your answer and not to show you how to do it I will cheat and just check.
first make sure some point in the middle satisfies your equation
82.07 = .01(36)^2 +1.1(36)+67 ????
93.64, well not too bad because your coefficients seem to be rounded to two places
try first point
75.39 = .01(9)^2 + 1.1(9) + 67 ???
78.09 not bad
check the other two points but I think you did it right but without carrying enough significant figures in your solution of the simultaneous equations.

Math  Jennie, Thursday, December 8, 2011 at 4:54am
Okay, I wasn't sure if my answer was right, so thank you!
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