The average test mark of the class? mark of a class of 20 student is 65. Twum's mark was recorded as 35 instead of 55. What is the correct average mark of the class

66

Step-by-step explanation:

Wrong total mark = 65 * 20 = 1,300

remainder of Tum score to be added= 55-35 = 20

Add this to total = 20 + 1300 = 1320

Correct average score = 1320/20 = 66

(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