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.

6b + 4 > \( \frac{b}{-1} \)
-1 x (6b + 4) > b
(-1 x 6b) + (-1 x 4) > b
-6b - 4 > b
-6b - 4 - b > 0
-6b - b > 4
-7b > 4
b > \( \frac{4}{-7} \)
b > -\(\frac{4}{7}\)

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 9) + (2 x 9 x 8) + (2 x 3 x 8)
sa = (54) + (144) + (48)
sa = 246

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.)

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.

(5a)(9ab) + (3a²)(8b)
(5 x 9)(a x a x b) + (3 x 8)(a² x b)
(45)(a¹⁺¹ x b) + (24)(a²b)
45a²b + 24a²b
69a²b

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