To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses:

(y - 1)(y - 3)
(y x y) + (y x -3) + (-1 x y) + (-1 x -3)
y² - 3y - y + 3
y² - 4y + 3

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)(2ab) + (8a²)(7b)
(5 x 2)(a x a x b) + (8 x 7)(a² x b)
(10)(a¹⁺¹ x b) + (56)(a²b)
10a²b + 56a²b
66a²b

The area of a triangle is equal to ½ base x height:

a = ½bh
a = ½ x 6 x 3 = \( \frac{18}{2} \) = 9

A trapezoid is a quadrilateral with one set of parallel sides.

For parallel lines with a transversal, the following relationships apply:

• angles in the same position on different parallel lines equal each other (a° = w°, b° = x°, c° = z°, d° = y°)
• alternate interior angles are equal (a° = z°, b° = y°, c° = w°, d° = x°)
• all acute angles (a° = c° = w° = z°) and all obtuse angles (b° = d° = x° = y°) equal each other
• same-side interior angles are supplementary and add up to 180° (e.g. a° + d° = 180°, d° + c° = 180°)

Applying these relationships starting with z° = 14, the value of w° is 14.