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 2 x 6) + (2 x 6 x 1) + (2 x 2 x 1)
sa = (24) + (12) + (4)
sa = 40

The area of a trapezoid is one-half the sum of the lengths of the parallel sides multiplied by the height:

a = ½(b + d)(h)
a = ½(4 + 2)(2)
a = ½(6)(2)
a = ½(12) = \( \frac{12}{2} \)
a = 6

To solve this equation, 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.)

-3c(c - y)
-3(-8)(-8 - 9)
-3(-8)(-17)
(24)(-17)
-408

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 equal sign and the answer on the other.

4x + 6 = -7 + 7x
4x = -7 + 7x - 6
4x - 7x = -7 - 6
-3x = -13
x = \( \frac{-13}{-3} \)
x = 4\(\frac{1}{3}\)

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 x 5b = (7 x 5) (a x b) = 35ab