Triangle JKL is similar to triangle MNO. What is the perimeter of triangle MNO

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

Which of the symbols correctly relates the two numbers below check all that apply 6? 6

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9