4$ would be the cost of the item
Answer: 
Step-by-step explanation:
Given
Vertex of the parabola 
Focus of the parabola 
As the x coordinate of vertex and focus is same and focus lie below the vertex, therefore the parabola is the type of

distance between Vertex and focus is 1 unit

Parabola becomes

Yes, that is correct because if you want to reduce it you divide 8 by 2 and 10 by 2 and you get 4/5
Answer: 21
Step-by-step explanation:
Using the slope formula the answer would be 1-(-1)/(-1)-6. The slope would be 2/-7. It would be a negative slope.