A
B
C
D
Explanation
Correct answer: A.
Choice A is correct. If one pound of grapes costs $, two pounds of grapes will cost times $, three pounds of grapes will cost times $, and so on. Therefore, pounds of grapes will cost times $, which is dollars.
Desmos solution:
Note: The line shows the cost for any number of pounds ; substituting for gives .
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect and may result from incorrectly adding instead of multiplying.
Choice C
Choice C is incorrect and may result from assuming that pounds cost $, and then finding the cost per pound.
Choice D
Choice D is incorrect and could result from incorrectly assuming that pounds cost $, and then finding the cost per pound.