A trapezoid is a quadrilateral with one set of parallel 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)(8ab) + (4a²)(8b)
(5 x 8)(a x a x b) + (4 x 8)(a² x b)
(40)(a¹⁺¹ x b) + (32)(a²b)
40a²b + 32a²b
72a²b

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 equal sign and the answer on the other.

-8x - 7 = \( \frac{x}{-8} \)
-8 x (-8x - 7) = x
(-8 x -8x) + (-8 x -7) = x
64x + 56 = x
64x + 56 - x = 0
64x - x = -56
63x = -56
x = \( \frac{-56}{63} \)
x = -\(\frac{8}{9}\)

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 equal sign and the answer on the other.

-5c + 9 = 8 - 6c
-5c = 8 - 6c - 9
-5c + 6c = 8 - 9
c = -1

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.

6a⁴ - 5a⁴ = 1a⁴