exam Maths Puzzle Numerical Ability

need answer :)
If f(x)=2x, then f(3) equals what?

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exam Other Question

Find the surface area of a right solid 8" high with the base of 10" x 10" x 4". Solve each of the following quadratic equations by completing the square. Show all necessary steps involved in finding the solutions.
a: x^2 - 6x + 8 = 0
b: x^2 = 4 - 7x
c: 3