Answer:
D)
Step-by-step explanation:
For every x, there can be only y.
A, B and C violate that.
Answer:

Step-by-step explanation:

Answer:
$69.90
Step-by-step explanation:
I multiplied $65 with 0.075 (Tax percentage). I got 4.875. I rounded that up to 4.9 (Tax). Then, I added the tax with the original price ($65) and I get $69.90