exam Maths Puzzle Numerical Ability

if f(x)=5x-1 find the following:
f(a-2)

thanks for your help

Heather

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exam Other Question

Could you please help me solve this? find the center (h,k) and radius r of the circle. I have no idea how to work out.
x^2+y^2-12x+6y+35=0 2x
-- = 40
5