A cube is a rectangular solid box with a height (h), length (l), and width (w). The volume is h x l x w and the surface area is 2lw x 2wh + 2lh.

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

a² - 5a - 24 = 0
(a + 3)(a - 8) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (a + 3) or (a - 8) must equal zero:

If (a + 3) = 0, a must equal -3
If (a - 8) = 0, a must equal 8

So the solution is that a = -3 or 8

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)(9ab) + (8a²)(3b)
(7 x 9)(a x a x b) + (8 x 3)(a² x b)
(63)(a¹⁺¹ x b) + (24)(a²b)
63a²b + 24a²b
87a²b

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).