X-0.075x=7400
Solve for x
0.925x=7400
x=7,400÷0.925
X=8,000
1. 4
2. 9
3. 21
are the answers
I see your last line is : c(x) = 0.9(x^2-10)^2 + 101.1
Let y = x^2, then c(y) = 0.9(y-10)^2 + 101.1
Apparently, c(y) is a parabola, min is 101.1 when y = 10, max is infinity
So let x^2 = 10 -> x = sqrt(10) or -sqrt(10), min is 101.1, max is infinity
Answer:

Given:

To find:

Step-by-step explanation:
