The difinite species of bird was introduced in the certain county 25 years ago. Biologists observe that population doubles every 10 years, and now population is 13,000.
(a) Find initial size of bird population?
(b) Compute bird population 2 years from now.
Assume you are driving car on the cold winter day (20°F outside) and engine overheats (at about 220°F). When you park, engine starts to cool down. Temperature T of engine t minutes after you park satisfies equation
ln(\frac{T-20}{200})=-0.11t
(a) Solve equation for T.
(b) Use part (a) to determine temperature of engine after 15 min (t = 15).