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.

(4a)(4ab) + (7a²)(3b)
(4 x 4)(a x a x b) + (7 x 3)(a² x b)
(16)(a¹⁺¹ x b) + (21)(a²b)
16a²b + 21a²b
37a²b

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.

(4a)(4ab) - (2a²)(4b)
(4 x 4)(a x a x b) - (2 x 4)(a² x b)
(16)(a¹⁺¹ x b) - (8)(a²b)
16a²b - 8a²b
8a²b

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.)

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.

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.