exam Maths Puzzle Numerical Ability

If f(x) = 4x - 3, find the following:

f(-1)

Can you show me how to figure this, I do not understand.

Thank you.

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exam Other Question

If 20 percent of x equals 80 percent of y, which of the following expresses y in terms of x?

(A) y=16% of x
(B) y=25% of x
(C) y=60% of x
(D) y=100% of x
(E) y=400% of x Justin has already saved $100 and wants to buy a playstation 2 for $129 about four weeks from now. To find how much he should save each week between now and then, he wrote 100+4x=139.99. Explain this equation.