Cracking The Ap Calculus ab Exam 2018

This    gives   us

V   =   8ekt

Next,   we  use the condition   that    V   =   12  at  time    t   =   5   to  solve   for k.

12  =   8e^5 k

    =   e^5 k

ln      =   5k

k   =       ln  

This    gives   us

V   =   8e

Finally,    we  plug    in  t   =   12, and solve   for V.

V   =   8e  ≈   21.169

43. B The first derivative is

The second  derivative  is

Evaluating  this    at  x   =   40, we  get

f′′(x)  =       =   1.350

44. B First, we will need to find the y-coordinate that corresponds to x = 1 : y = tan 1 ≈ 1.557. Next,