Explanation
Correct answer: A.
Choice A is correct. It's given that Tilly earns dollars for every hours of work. This can be represented by the proportion . The amount of money, , Tilly earns for hours of work can be found by setting up the proportion . This can be rewritten as . Dividing both sides by results in .
Desmos solution:
Note: The listed p and w values make the rate calculation and 39p print the same amounts.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect. This is the amount of money Tilly earns in dollars per hour, not the amount of money Tilly earns for hours of work.
Choice C
Choice C is incorrect. This is the amount of money Tilly earns for hours of work plus , not the amount of money Tilly earns for hours of work.
Choice D
Choice D is incorrect. This is the amount of money Tilly earns for hours of work minus , not the amount of money Tilly earns for hours of work.