Shelby has already taken 31 quizzes during past quarters, and she expects to have 1 quiz during each

Shelby has already taken 31 quizzes during past quarters, and she expects to have 1 quiz during each week of this quarter. After attending 9 weeks of school this quarter, how many quizzes will Shelby have taken in total?

Calculate the latest quiz amounts:
1 quiz per week * 9 weeks = 9 quizzes.

Now add that to our starting amount of 31 quizzes
31 + 9 = 40 quizzes