exam Maths Puzzle Numerical Ability

I need help perfoming the indicated operation

f(x)=x+2 g (x)=x2-1

I need to find (g of)(x)

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exam Other Question

Please check my work on this problem: * represents multiplying

x - 6/x-3 = 2x/x-3

I worked it out like this:

x-3/1 (x-6/x-3) = x-3/1 (2x/x-3)

x(x-3/1) - x-3/1 * 6/ Please help. I'm having problems with this.

1) Use the arithmetic sequence of numbers 2, 4, 6, 8, 10� to find the following:
a) What is d, the difference between any 2 terms?