exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

If f(x) = 5x - 1, Ifind the following:
f(a-2)

Thanks,
Ashley

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exam Other Question

what is the total surface are of a cylinder with a height of 3cm, and a radius of 6cm? Simplify, Subtract
3 {{{ sqrt (25x-4)}}} {{{sqrt (25x)}}}