Posted by **Hayley** on Sunday, April 15, 2012 at 10:56pm.

1. Which situation is not a function?

a) the number of days d below freezing each month

b) the total cost of an item that costs x dollars with 7% sales tax

c) the number of miles driven at a constant speed of 45 miles per hour after x hours

d) the total cost of n tickets that cost $23 each

Answer is B