Question

Gretta has 40 raffle tickets to sell. She is required to sell at least 15 tickets. She sells the raffle tickets for $10 each.

The amount of money Gretta makes from selling x raffle tickets is represented by a function.

f(x)=10x

What is the practical range of the function?



Responses

a all multiples of 10 between 150 and 400, inclusive
a all multiples of 10 between 150 and 400, inclusive

b all integers from 15 to 40, inclusive
b all integers from 15 to 40, inclusive

c all real numbers
c all real numbers

d all multiples of 10 between 0 and 400, inclusive

Answer 1

Answer: a.

Reason: x can be 15, 16, ..., 40 (number of tickets sold), so f(x)=10x yields 10·15 = 150 up to 10·40 = 400. Since x is an integer, the outputs are the multiples of 10 from 150 through 400 inclusive.