Answer:
326.56
Step-by-step explanation:
2x(3.14)x4^2 = 100.48
11.48+(2x(3.14)x4x9) = 326.56
Step-by-step explanation:
it is unbiased because the people are chosen at random
Remark
You'll see it a whole lot easier if you make a substitution so that it looks like something you have already seen
Solution
let y = x^2
x^4 = x^2 * x^2
x^4 = y * y
x^4 = y^2
Now the expression becomes
y^2 + 8 y - 9 = z
(y + 9)(y - 1) = z
Now put the x^2 back in.
(x^2 + 9) ( x^2 - 1) = z
x^2 - 1 becomes x + 1 and x - 1. At this level x^2 + 9 can't be factored.
Answer
(x^2 + 9) (x + 1)(x - 1)
9/16
7 of the squares are 4 so we just substract that from the total of 16 and we get 9
