Math - Others

Functions Solutions

While attending college, Karyna is making money by tutoring students in College Algebra. Karyna charges $15 per hour and meets each student for an hour a week. The holidays are approaching, so Karyna decided she would like to purchase treats for each student she tutors. The treats for the students cost $2.50 each, she owes her roommate $10, and she still needs to buy groceries for the week. If I represents the number of students Karyna is tutoring, the following functions can be used to represent this situation where C(x) is Karyna's costs and R(x) is the amount of revenue she makes tutoring.
C(x) = 2.50x + 10
R(x) = 15x
Which function represents the amount of money, G(x), Karyna has left to buy groceries for the week?
○ G(x) = 12.50x + 10
○ G(x) = 12.50x - 10
○ G(x) 17.50x + 10
○ G(x) = 17.50x - 10