exam Maths Puzzle Numerical Ability

Factor the following expressions completely:

a: x^2-2x-24
b: 2x^2y-32y

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exam Other Question

If log a ≈ 0.250, then log a2 ≈
a. 0.125
b. 0.500
c. 0.017
d. 1.189 Can someone please help me solve this problem:

For what value of k is f(g(x)) = g(f(x))?

f(x)=3x+k and g(x)=x-4/3

I think when k is found we inverse it but I am drawing a blank - please help