exam Maths Puzzle Numerical Ability

Let f(x)=x^2+4, and g(x)=x-1 Compute (g 0 f)(x), (f 0 G)(x)

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exam Other Question

write equation in standard form?

y-4=-(x-1)
I need help trying to solve this problem..you are trying to find the slope.
(1/12, 1/8) (3/7, 9/17)..THANKS!