Simplify the expression;
10√7-√28+6√180

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 .

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Write the expression 7x^3-28xy^2 as the product of 3 factors