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.

-9c - 1 < \( \frac{c}{4} \)
4 x (-9c - 1) < c
(4 x -9c) + (4 x -1) < c
-36c - 4 < c
-36c - 4 - c < 0
-36c - c < 4
-37c < 4
c < \( \frac{4}{-37} \)
c < -\(\frac{4}{37}\)

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

v = h x l x w
v = 9 x 9 x 7
v = 567

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.

6a x 6b = (6 x 6) (a x b) = 36ab

The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)² : a = π r².

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.