To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(5a)(5ab) - (5a²)(5b)
(5 x 5)(a x a x b) - (5 x 5)(a² x b)
(25)(a¹⁺¹ x b) - (25)(a²b)
25a²b - 25a²b
0a²b

A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r²h and the surface area is 2(π r²) + 2π rh.

Angles around a line add up to 180°. Angles around a point add up to 360°. When two lines intersect, adjacent angles are supplementary (they add up to 180°) and angles across from either other are vertical (they're equal).

The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):

sa = 2lw + 2wh + 2lh
sa = (2 x 6 x 1) + (2 x 1 x 3) + (2 x 6 x 3)
sa = (12) + (6) + (36)
sa = 54

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.