exam Maths Puzzle Numerical Ability

The right cone has the h = 4 cm and r = 3 cm, what is the volume?

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exam Other Question

three frends on a fishing trip pay $100 each to share the rent of a cottage. the cost per person varies inversely as the number of pepl working on the job. it takes 18 weeks for 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...