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.

(3a)(8ab) + (2a²)(4b)
(3 x 8)(a x a x b) + (2 x 4)(a² x b)
(24)(a¹⁺¹ x b) + (8)(a²b)
24a²b + 8a²b
32a²b

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

v = h x l x w
v = 7 x 5 x 5
v = 175

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 - 6)(y + 5)
(y x y) + (y x 5) + (-6 x y) + (-6 x 5)
y² + 5y - 6y - 30
y² - y - 30

A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.

A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).