Round your answer to the nearest whole number, if necessary.
-The function $f(t)=-0.4 t^{2}+10 t$ approximates 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 6 minutes.
A) 66 digits
B) 26 digits
C) 46 digits
D) 86 digits

Question

Quizplus · Accepted Answer

To find the number of digits recalled after 6 minutes, substitute $t = 6$ into the function $f(t) = -0.4t^2 + 10t$. This gives $f(6) = -0.4(6)^2 + 10(6) = -0.4(36) + 60 = -14.4 + 60 = 45.6$. Rounding to the nearest whole number, we get 46 digits.

Round Your Answer to the Nearest Whole Number, If Necessary f(t)=−0.4t2+10tf(t)=-0.4 t^{2}+10 tf(t)=−0.4t2+10t

Round Your Answer to the Nearest Whole Number, If Necessary $f(t)=-0.4 t^{2}+10 t$