A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.

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)(3ab) - (8a²)(2b)
(5 x 3)(a x a x b) - (8 x 2)(a² x b)
(15)(a¹⁺¹ x b) - (16)(a²b)
15a²b - 16a²b
-1a²b

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the < sign and the answer on the other.

-4c + 4 < -3 - 9c
-4c < -3 - 9c - 4
-4c + 9c < -3 - 4
5c < -7
c < \( \frac{-7}{5} \)
c < -1\(\frac{2}{5}\)

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.

6a x 9b = (6 x 9) (a x b) = 54ab

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 3 x 5) + (2 x 5 x 6) + (2 x 3 x 6)
sa = (30) + (60) + (36)
sa = 126