help i can't figure this out it's algebra

Step-by-step explanation:
Part A:
The maximum point is (2.5, 2531.25). This represents that $2.5 should be decreased from the original price to achieve the most profit from t-shirt sales.
Part B:
The y-intercept is seen to be around (0, 2500). This tells us that the profit made from the original price is $2500.
Part C:
Yes. The point (25, 0) is a solution. It tells us that if we decreased the original price by $25, we would make no/zero profit.
Answer:
Step-by-step explanation:
A. The optimal decrease in price to gain the maximum profit in sale:
Meaning if you reduce the price by $2.5, you will gain the maximum profit of $2531.25
B. It represents the amount of profit without any change in the current price on the t-shirt.
By shifting and expanding the original equation [tex]y=-x^{2}\\[/tex]
[tex]y = -5(x-2.5)^{2} + 2531.25[/tex]
[tex]x = 0 => y = 2500[/tex]
C. The solution is as in part B
It represents by reducing the price of each t-shirt, there is an initial increase in profit but eventually it will drop.