Solve the problem.
-The polynomial $- 0.3 \mathrm { t } ^ { 2 } + 10 \mathrm { t }$ describes the average number of digits that participants in a memorization experiment were able to recall after t minutes. Find the number of digits recalled after 9 minutes. Round to the
Nearest digit.
A)46 digits
B)66 digits
C)86 digits
D)106 digits

Question

Quizplus · Accepted Answer

Substituting $t = 9$ into the polynomial $-0.3t^2 + 10t$, we get $-0.3(9)^2 + 10(9) = -0.3(81) + 90 = -24.3 + 90 = 65.7$. Rounding to the nearest digit gives 66.

Solve the Problem −0.3t2+10t- 0.3 \mathrm { t } ^ { 2 } + 10 \mathrm { t }−0.3t2+10t

Solve the Problem $- 0.3 \mathrm { t } ^ { 2 } + 10 \mathrm { t }$