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)(7ab) - (9a²)(5b)
(5 x 7)(a x a x b) - (9 x 5)(a² x b)
(35)(a¹⁺¹ x b) - (45)(a²b)
35a²b - 45a²b
-10a²b

A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.

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.

(3a)(5ab) + (6a²)(9b)
(3 x 5)(a x a x b) + (6 x 9)(a² x b)
(15)(a¹⁺¹ x b) + (54)(a²b)
15a²b + 54a²b
69a²b

To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

6a + 6a = 12a

The area of a parallelogram is equal to its length x width:

a = l x w
a = a x b
a = 4 x 5
a = 20