Question 863498
Helping just with your second question.


x is for months, and y is for how tall.
This is a simple two dimensional linear system problem.
Jerry starts at 50 inches and Adam at 47 inches in tallness.
Jerry's slope or growth rate is {{{(1/24)}}} inches per month and Adam's is {{{(1/8)}}} inche per month.


Their tallness equations are:
Jerry: {{{highlight(y=(1/24)x+50)}}}
Adam:  {{{highlight(y=(1/8)x+47)}}}


You want to know the point of intersection for these two equations.  
Find this intersection point, either algebraically or graphically.