A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 one year ago
A store charges their customers based on the number of items that they buy. Jane bought four items and was charged $15 and George bought twelve items and was charged $39. Write a function to model the cost based on the number of items you buy. Then determine how much you bought if you were charged $33.
A)
f(x) = 3x + 3; f(10) = 33
B)
f(x) = 3x + 3; f(33) = 102
C)
f(x) =
1
3
x + 3; f(90) = 33
D)
f(x) =
1
3
x + 3; f(33) = 14
 one year ago
A store charges their customers based on the number of items that they buy. Jane bought four items and was charged $15 and George bought twelve items and was charged $39. Write a function to model the cost based on the number of items you buy. Then determine how much you bought if you were charged $33. A) f(x) = 3x + 3; f(10) = 33 B) f(x) = 3x + 3; f(33) = 102 C) f(x) = 1 3 x + 3; f(90) = 33 D) f(x) = 1 3 x + 3; f(33) = 14

This Question is Closed

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0Use the points (4, 15) and (12, 39) and find the equation of the line that passes through them.

TestTakingLifesaver
 one year ago
Best ResponseYou've already chosen the best response.0@mathstudent55 This is a word problem, please read above, there is nothing to do with graphs here.

phi
 one year ago
Best ResponseYou've already chosen the best response.1mathstudent gave you a good idea.

TestTakingLifesaver
 one year ago
Best ResponseYou've already chosen the best response.0not really i am totally lost can you explain

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0If I read the problem correctly, it asks you to "Write a function to model the cost based on the number of items you buy."

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0Since you are given information for two instances of purchases, matching one number of items to a price and a second number of items to another price, these are two points on a line. The function they are looking for has the equation of a straight line. If you use the given information, find the equation of the line. Then once you have the function, set the function equal to 33 and solve for x, to see what number of items corresponds to $33.

TestTakingLifesaver
 one year ago
Best ResponseYou've already chosen the best response.0would that be 10
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.