20 points + brainliest = 30 points!

see below

Step-by-step explanation:

Addition and subtraction are both closed under polynomials.

That means that when we add and subtract polynomials, we will end up with a polynomial

f(x) + g(x) will =  always be a polynomial when we start with polynomials

f(x) - g(x) will =  always be a polynomial when we start with polynomials

Step-by-step explanation:

A polynomial is an expression consisting of variables and coefficients.

and are polynomial functions.

Adding polynomials and subtracting polynomials is essentially combining like terms of polynomial expressions.

is always a polynomial

is always a polynomial

If you add, subtract or multiply any two polynomials then the result will be always a polynomial.

192/15 = 12.8.

12.8

step-by-step explanation:

192/15 is 12.8.

however, it says to round to the nearest foot, which would equal 13.