Critical points is where the derivative (slope) is zero or does not exist. So to do this we have to find the derivative of our function:

So we apply chain rule:
=

Set our first derivative to zero and solve for x:
3(x^2 - 1) * 2x = 0
So we can see that (by plugging in) 0, -1 and 1 makes our solution true
So our critical value is x = 0, x = -1, x = 1
What I did was add all the x's since you are trying to find the perimeter then I got 16 and then you add the whole numbers. 16x+3
I believe it is C hope this helps
Answer:
22.4
Step-by-step explanation:
112 ÷ 5 is 22.4.
Answer: She ordered 4 toppings.
Step-by-step explanation:
Given: Total cost of pizza = $ 12.90
Cost of pizza =$7.50
Price per topping = $1.35
Let x = Number of toppings,
Total cost of pizza = (Cost of pizza) + (price per topping) × (Number of topping)

hence, she ordered 4 toppings.