1. Donald scored 76%, 79%, 84%, and 87% on his four geometry tests this semester. There is one test remaining. Donald's homework average is 93%. His teacher will count each test score and the
homework average as one-sixth of Donald's final grade.
a. Write an equation to determine the score that Donald must attain on his last test to have a
final grade of exactly 85%.
b. Solve the equation and justify the answer by showing your work.
c. Write a sentence explaining what your answer means.