Classify the following polynomials. Combine any like terms first. X^2+ 3x + 2x - 2x^2
X^3+ 4x - 4x - 4x^2
X^3+ 2x - X^3 – 2x^2 + 3

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

Ingredient c: 1/4 cup for 2/3 serving or ingredient d: 1/3 cup for 3/4 serving which unit rate is smaller