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

a = l x w
a = a x b
a = 5 x 7
a = 35

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 + 4)(y - 9)
(y x y) + (y x -9) + (4 x y) + (4 x -9)
y² - 9y + 4y - 36
y² - 5y - 36

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 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.

z + 2 > -1 + 7z
z > -1 + 7z - 2
z - 7z > -1 - 2
-6z > -3
z > \( \frac{-3}{-6} \)
z > \(\frac{1}{2}\)

When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)