Q1 Convert Q 170555t to the form y aekt Q2 Give the starti
Q1) Convert Q = 17(0.555)^t to the form ???y = a*e^(kt).
Q2) Give the starting value a, the growth rate r, and the continuous growth rate k.
?Q=2^-((?t-9)/7)
Round your answer for a to four decimal places and your answers for r and k to two decimal places.
Solution
comparing the two equations we can write
.555 = e^k
taking ln on both sides
ln .555=k ln e
-.5887 = k
therefore, equation is
Q = 17 e^-.5887 t
a = 17
k = -.5887
1) Q = 2^-((t-9)/7)
= 2^(-t/7)*2^(9/7)
=2^9/7[2^(-1/7)]^t
a = 2^9/7= 2.438
1+r = 2^(-1/7) = 1/1.04 = 0.96
r = -0.038 = - 3.8%
Now Q = ae^kt comparing with this
Q = 2.438(0.96)^t
e^k = 0.96
take ln on both sides:
k = ln(0.96) =-0.04
So, k = -0.04 = -4%
