What is the surface area of a rectangular prism that measures 12 meters by 11 meters by 9 meters

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 .

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Can anyone me with 32,33,36,37,and 40.