How can you round 0.273 to the nearest tenth

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

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 .

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.