Answer:
x = -6 and x = 4
Step-by-step explanation:
In math, the critical points of a function are the points where the derivative equals zero.
So, first we will find the derivative of the function. The derivative is:

Now, we are going to make the derivative equal zero and find the answers of the equation.

So we have that the critical points are the answers to this equation:

and

Thus, the critical points are x=-6 and x=4
11.25 - 10.5 = 0.75
Knowing that this is the profit she makes with one share, so:
20 * 0.75 = 15
Caroline made $15 profit.
the answer would be x=−0.870452,0.712370
X= -5/2 (0.4)
or
x= -2 1/2 (2.5)
No because 3*2= 6 while 5*2=10 so if it was equivalent it would of been 3/5 to 6/10