exam Maths Puzzle Numerical Ability

I have a couple more problems today I need steps and solutions for if anyone would be so kind.

Factor each difference or sum of two cubes.

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exam Other Question

Let f(x) = 4/3x + 8 and g(x) = -x-5, At what point do f(x) and g(x) intersect? (Write the coordinates) The sum of two numbers is 20. Twice one number is 4 more than four times the other. Find the numbers.