1. The problem statement, all variables and given/known data ln(3x+5) Determine intervals on which the function is increasing, decreasing, concave up, and concave down. 2. Relevant equations 3. The attempt at a solution So I did f '(x) = 3/3x+5 this gives me 3x+5 = 0, and I get x = -5/3 (point where the y is zero) Now, I did f '' (x), and got -3/(3x+5)^2 this gives me (3x+5)(3x+5), i did a number line test, with the only value -5/3, and anything below -5/3 is negative, and before -5/3 is positive this gives me that, the function is decreasing after -5/3, and increasing after -5/3. Now what about the concavity?