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:
300 + f(x)
270
240
210
180
150
120
90
60 +
30
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)
(10 points)

11

step-by-step explanation:

32.50-7.50=25

225/25=11

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

the answer is 1/4

step-by-step explanation: