Three single-digit numbers multiply to make 504 write the missing numbers

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

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 is a reasonable estimate of the amount of water in a small, inflatable pool used by children?