exam Maths Puzzle Numerical Ability

In the book it asks me him to traslante this:

5x

Z4

y + 5

2(w + 1)

x3 - 2

(x - 2)

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How do you solve this so I can understand f(x)=-2x^2+2x+6 Fast Food. If four out of five doctors prefer fast food, then at a convention of 445 doctors, how many prefer fast food?