Explain what the following statement means: Polynomials are closed under the operations of
addition and subtraction.
Provide one addition example and one subtraction
examnle to demonstrate

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 .

How many 3/8s are in 6 plz someone tell me now

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.