You score an 86 on the first of two exams. Write and solve an equation to find the score x that you need on the second exam to have a mean score of 90.

Answer 1

94 is needed on the 2nd

(86+x)/2 =90

86+x = 2(90) = 180

x = 180-86 = 94

86 is 4 below 90

so you need a grade that's 4 above 90 = 94

to get an average of 90