Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the zeros 7, square root of 2

Can someone explain the elimination method to me for this problem?

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

1. a right triangle is graphed on a coordinate plane. find the length of the hypotenuse. round your answer to the nearest tenth. 2. use the angle relationship in the figure below to solve for the value of x. assume that lines a and b are parallel and line c is a transversal.