Theaverage, ormean,Upper TT,of three examgrades,vv,ss,and xx,is given by the following formula.
T = v+ s+ x Over 3
(a) Solve the formula for x.
(b) Use the formula in part(a) to solve this problem. On your first two exams, your grades are v= 86% and s=86%. What must you get on the third exam to have an average of 89%?