Question 1007538
Use your calculator to find
f(x) = 2*e^3x + 1
f(.20) = 2*e^(3*.2) + 1 = 4.644
Then set it equal to 8 and solve
8 = 2*e^3x + 1
7 = 2*e^3x
3.5 = e^3x
ln 3.5 = 3x
x = (1/3)ln 3.5 = .418