The graph below shows a company's profit f(x), in dollars, depending on the price of erasers x, in dollars, being sold by the company:
graph of quadratic function f of x having x-intercepts at ordered pairs 0, 0 and 8, 0. the vertex is at 4, 270
part a: what do the x-intercepts and maximum value of the graph represent? what are the intervals where the function is increasing and decreasing, and what do they represent about the sale and profit? (6 points)
part b: what is an approximate average rate of change of the graph from x = 1 to x = 4, and what does this rate represent? (4 points)
this is the image, not sure if it will open though.

part a:

the x-intercept of the graph represents that there was no profit when the price of the eraser was $ 8 and also there will be no profit when no eraser is sold.

and the maximum value of the graph represents that there was a maximum profit of $ 2760 obtained by the company when the company sold erasers at a cost of $ 4 .

( since, the vertex of the graph is at (4,270) )

the interval where the function is increasing is: (-∞,4)

this represents that the profit is increasing when the erasers are sold at less than $ 4

and the function is decreasing in the interval (4,∞)

this represents that the profit is decreasing when the erasers are sold at a price greater than $ 4.

part b:

the average rate of change from x=1 to x=4 is calculated by:

it represents that the profit of the company is increasing at the rate of $ 50 per increase in the prize of the eraser.

can someone answer this question plz

step-by-step explanation:

the answer is 13 cm