Which table represents a function ? please help quick

The first table (the one that has -3 as the first number in the table)

Step-by-step explanation:

A table is a function when the x column doesn't have any numbers repeated.  

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168