Idk how to do this any help would be appreciated.
Plug in your numbers:
https://www.quora.com/Consider-f-x-g-x-and-h-x-where-h-x-fog-x-Given-that-g-3-7-g-3-4-and-f-7-5-find-the-gradient-of-the-normal-to-the-curve-of-h-at-x-3-How-can-I-solve-this-question
+237 
