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Logarithmic Function

Problem
A germ population has a growth curve $Ae^{0.4t}$. At what value of $t$ does its original value doubled?

A. t = 7.13	C. t = 1.73
B. t = 1.37	D. t = 3.71

Problem
Evaluate $\displaystyle \int_0^1 \dfrac{x \, dx}{x^2 + 2}$.

A. 0.2027	C. 0.2270
B. 0.2207	D. 0.2072