Answer:
14.4 dollars
Step-by-step explanation:
If you buy an item at $18 dollars with a 20% discount, you will pay 18 - 3.6 = 14.4 dollars
The lowest value for y is 3, when x=2, so (2,3) is the vertex.
Answer:

Step-by-step explanation:
2x = -3
divide 2 from both sides

Add one to the other side and y=1/2