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.

(7a)(5ab) - (2a²)(2b)
(7 x 5)(a x a x b) - (2 x 2)(a² x b)
(35)(a¹⁺¹ x b) - (4)(a²b)
35a²b - 4a²b
31a²b

A line on the coordinate grid can be defined by a slope-intercept equation: y = mx + b. For a given value of x, the value of y can be determined given the slope (m) and y-intercept (b) of the line. The slope of a line is change in y over change in x, \({\Delta y \over \Delta x}\), and the y-intercept is the y-coordinate where the line crosses the vertical y-axis.

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.

7b - 4 > 9 + 6b
7b > 9 + 6b + 4
7b - 6b > 9 + 4
b > 13

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.

8a + 9a = 17a

The volume of a cube is height x length x width:

v = h x l x w
v = 1 x 1 x 4
v = 4