Not sure how to do this
the function f(r) gives the area of a circle with radius r. it can be written in equation form as f(r) = 3.14r2. what is f(3

 The correct option is (B) 28.26.

Step-by-step explanation:  Given that the function f(r) gives the area of a circle with radius r. It can be written in equation form as follows :

We are to find the value of f(3).

To find f(3), we must substitute r = 3 in the definition of f(r).

Putting r = 3 in the expression for f(r), we get

Thus, the value of f(3) is 28.26.

Option (B) is CORRECT.

(x3 + 6x2 + 2x - 6) • (x - 1)

step-by-step explanation:

polynomial long division :

3.2     polynomial long division

dividing :   x4+5x3-4x2-8x+6

                              ("dividend")

by         :     x-1     ("divisor")

dividend     x4   +   5x3   -   4x2   -   8x   +   6

- divisor   * x3     x4   -   x3            

remainder         6x3   -   4x2   -   8x   +   6

- divisor   * 6x2         6x3   -   6x2        

remainder             2x2   -   8x   +   6

- divisor   * 2x1             2x2   -   2x    

remainder               -   6x   +   6

- divisor   * -6x0               -   6x   +   6

remainder                     0

quotient :   x3+6x2+2x-6   remainder:   0

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.