Can anyone guide me through this one please?

The set

B = {{1, {2, 3}}, 4, {5, 6, 7}, 8}

consists of 4 elements:

• {1, {2, 3}}

• 4

• {5, 6, 7}

• 8

so the correct choices are 4, 8, and {1, {2, 3}}.

the correct answer is 45x

9×5=45 then add the x

(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