exam Maths Puzzle Numerical Ability

1. Which of the following are functions? Explain your reasoning for a, b, and c.

a. f(x) = 2 if x>1 otherwise f(x) = -1

b. f(x) = 5 if x>0 or f(x) = -5 if x<0 or f(x) = 5 or -5 if x = 0

c. f(x) = x/10

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exam Other Question

A cyclist traveling at a constant speed completes 3/5 of a trip in 1 1/2 hrs. In how many additional hours will the cyclist complete the entire trip? The problem states, Of all possible quotients of the numbers 10, -1/2, -5, and 1/5, which two produce the largest quotient? Which two produce the smallest quotient?

I am not exactly sure how to figure this out.