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Thank you for your help, I don't know how to use the quadratic formula to solve this. Will the answer be numbers or an expression?

a) Find the values of k and c in the equation y=c+kx-x^2
b) Find the co-ordinates of the highest point of the graph.

Please help, thank you!

A stone was thrown from the top of a cliff 60 metres above sea level. The height H metres, of the stone above sea level t seconds after it was released is given by H(t)=-5t^2+20t+60.

a) Find the...