exam Maths Puzzle Numerical Ability

You have 50 microwaves. Out of the 50 you have 4 defective ones. What is the probability that 2 out of the first 5 microwaves sold are defective? and how do I set up the equation?

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exam Other Question

When fifteen is subtracted from four times the sum of seven and twice some number, the result is 45 Level 1, General Polynomials, Degree 2

Write your answer in the form (as + b) (cs +d) .... (es +f)

New Problem, Factor:

15 s2 - 19 s + 6