At the start of the chapter you were given an equation which modelled the leap of
a dolphin as it ‘flew’ out of the water. The equation is h = −0.4d2 + d, where h is
the dolphin’s height above water and d is the horizontal distance from its starting
point. Both h and d are in metres.
1 How high above the water is the dolphin when it has travelled 2 m horizontally
from its starting point?
2 What horizontal distance does the dolphin cover when it first reaches a height of
3 What horizontal distance does the dolphin cover when it next
reaches a height of 25 cm? Explain your answer.
4 What horizontal distance does the dolphin cover in one leap?
(Hint: What is the value of h when the dolphin has completed
5 Can this dolphin reach a height of:
a 0.5 m? b 1 m during a leap?
How can you work this out without actually solving the
6 Find the greatest height that the dolphin reaches during a leap.
*I REALLY NEED YOUR HELP. ): I DON'T WANNA GET AN E.