**The path of a toy rocket fired into the air can be modelled by a parabola. The rocket, after being launched from the ground, reaches a height of 18 m after 6 seconds and the duration of the flight is 15 seconds.**

**Use algebra to show that the maximum height reached by the toy rocket is 18.75 m.**

The answer uses **h = kt(t - 15)** as the correct equation, could someone explain how to get this?

As it is a parabola shouldn't it be **y = ax^2 + bx + c **or **y = a(x - h)^2 + k **instead?

EighthMersennePrime Nov 19, 2019

#2**+1 **

wow, welcome back Eight MersennePrime!

After 2 years (checked your profile) you are back!

CalculatorUser Nov 20, 2019