D it's store d, it's the cheapest
Answer:

Step-by-step explanation:
y = 18 + 3x²
- 18 - 18
__________

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Answer:
$1.50
Step-by-step explanation:
If you do cost per quantity you would get $9 over 6 visits. Then you divide both sides by 6 because to get to one by 6 it's 6 so when you divide both sides by 6 you would get 1.5 over 1 and all you do is add a zero because you're dealing with money
Hope this helps :)
The answer is 6. 8-6(6) = -28.