exam Maths Puzzle Numerical Ability

Dick is now seven times as old as Harry. In six years Dick will be five times as old as Harry. How old will Harry be in 5 years?

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exam Other Question

given that f(x)=5x2+4x find each of the following

a) f(0)
b) f(-1)
c) f(3)
d) f(t)
e) f(t-1)

Can someone explain this thanks... A projectile is launched upward at an initial velocity of 64 ft/sec from a platform. It took 8 sec to hit ground. How tall was the platform?