It is important to make a drawing of what they are telling you.
Once you have your drawing, its a matter of setting up the ratio of the smaller triangle's sides to the larger triangle.
Bigger triangle is ABC, where AB = AD + DB ==> 14 + 4 = 18
For every growth or decay problem, if they don't provide you with the k constant value, you have to calculate what it is with the given information.
I always underline the important information given.
"The population P of a city is given by P=2500e^kt, where...
I like to use an acronym I learned form a High School Student, CONI POI
Now they tell us right away that order doesn't mater, so we automatically know we are going to use...