Given n integers a1, a2,. . , an, not necessarily distinct, prove that there exist integers k and i with 0

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 .

Simplify the expression 10/11(22z) + (a+5) -1

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?