Erics 4 test grades are 85, 75, 97, 93 . What must she make on her 5th test to have an average of 87?

Answer 1

(85 + 75 + 97 + 93 + x)/5 = 87
350 + x = 435
x = 85

Answer 2

how did you get 435?

Answer 3

to get rid of the denominator ( 5 ), multiply both sides of the equation by 5/

so, 5 cancels out of the left side and
5 * 87 = 435 on the right side

Answer 4

Determine the values of x for which x-5/3x+6 is undefined�