The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):

sa = 2lw + 2wh + 2lh
sa = (2 x 3 x 2) + (2 x 2 x 2) + (2 x 3 x 2)
sa = (12) + (8) + (12)
sa = 32

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).

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.

(8a)(6ab) + (6a²)(7b)
(8 x 6)(a x a x b) + (6 x 7)(a² x b)
(48)(a¹⁺¹ x b) + (42)(a²b)
48a²b + 42a²b
90a²b

To solve this equation, isolate the variable for which you are solving (a) on one side of the equation and put everything else on the other side.

5a + 2x = -8a + 9x + 5
5a = -8a + 9x + 5 - 2x
5a + 8a = 9x + 5 - 2x
13a = 7x + 5
a = \( \frac{7x + 5}{13} \)
a = \( \frac{7x}{13} \) + \( \frac{5}{13} \)
a = \(\frac{7}{13}\)x + \(\frac{5}{13}\)

The surface area of a cylinder is 2πr² + 2πrh:

sa = 2πr² + 2πrh
sa = 2π(8²) + 2π(8 x 3)
sa = 2π(64) + 2π(24)
sa = (2 x 64)π + (2 x 24)π
sa = 128π + 48π
sa = 176π