Question

A function is created to represent the amount of money spent on lunch if you spent 5 dollars a day. What restrictions would be made to the range?

Answer 1

old question but will respond so this can be closed

in this case, your domain (x) is the # of days, which can only be positive integers (starting from x = 1 on the first day)
therefore, since you spend $5 per day, your range values can only be 5*1 = 5, 5*2 = 10, etc. which means the range can only be positive multiples of 5.