I'm learning the exact same thing so give me some question and I can see what I can do!
Elite marathon race times improved from 5 to ~20 years, remained linear between ~20 and ~35 years, and started to increase at the age of ~35 years in a curvilinear manner with increasing age in both women and men. The sex difference in elite marathon race time increased non-linearly and was lowest at the age of ~49 years.
It’s B. k. If you think about it and try to solve it in a notebook you’ll get the answer. Hope this helps
I believe the answer is N+14=72
F(x) + g(x)
3x-7+6x+4
=9x-3
