exam Maths Puzzle Numerical Ability

Write an equation for each function in the form f(x)= mx+b.

16. f(3)=9, f(5)=15
17. f(-2)=4, f(2)=-16
18. f(0)=5, f(-5)=10
19. f(10)=4, m=1/2

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exam Other Question

Can anyone help me with this?

My problem is how to rationalize the denominator:

2/ sqrt[6] - sqrt[5]
how would you get the inverse notation of

h(x)=2/3(x+4)



(g o g)o f
f(x)=1-x2 g(x)=3/4x+2