If the perimeter of a square is 20 inches, find the length of a diagonal. Round your answer to the nearest tenth. Diagonal length = [x] inches

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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 .

Evaluate the expression. (9 + 5)(3 + 2)0

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265