exam Maths Puzzle Numerical Ability

If y varies directly with x, and y=400 when x=1000, find the constant of variation k.

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exam Other Question

Given: f(x)= 7-2x and g(x)= 2x^2-1, find (f-g)(x) and (f*g)(x).

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Matt If a license plate does not contain any vowels (A, E, I, O, U) or the number 5. How many different possibilities outcomes for the license plate?