The plant will be 34 millimeters after 8 months and 118 millimeters after 3 years. I solved this using the formula y=10+3x, where you are solving for y. You would replace x with the number of months and then solve.
The speed of the current that Micah rows his boat on would be 3 miles per hour assuming that he is rowing 4.48 miles downstream with the current, in 0.32 hours.