Need answer ! 15 points! is the set of multiples of 5 closed under division? explain why or provide a counterexample if not. a. yes, because the quotient of any two multiples of 5 is also a multiple of 5. b. yes, because the quotient of any two multiples of 5 is also a multiple of 10. c. no, and a counterexample is 100 ÷ 5 = 20. d. no, and a counterexample is 25 ÷ 50 = .

(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

215.92 dollars is the answer