Solve the Problem $D$ Digits In $t$ Minutes, Where $D = - 0.2 t ^ { 2 } + 9 t .$

question 148

Multiple Choice

Solve the problem.
-Participants in a memorization experiment were able to recall an average of $D$ digits in $t$ minutes, where $D = - 0.2 t ^ { 2 } + 9 t .$ Use the graph below to find the approximate value of $- 0.2 t ^ { 2 } + 9 t$ for $t = 2$ .

• A)37 digits
• B)-3 digits
• C)57 digits
• D)17 digits