Posted by **elizabeth** on Wednesday, April 20, 2011 at 9:43am.

My kids are stuck on this they've no idea what to do and I can't help them out either!

Darren throws a stone from the top of a vertical cliff into the sea below.

The trajectory of the stone can be modelled by the quadratic equation

y = -(x^2/3)+2x+24

where y represents the height in metres of the stone above sea level, and x is the horizontal distance of the stone from the bottom of the cliff

measured in metres.

- maths -
**MathMate**, Saturday, April 23, 2011 at 7:48pm
We don't see a question here!

- maths -
**prashant**, Wednesday, June 11, 2014 at 5:25pm
the demand y for a commodity when its price is ,3x-15/2x+7 find the elasticity of demand when price is 10

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