The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.

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.)

-4c(c - z)
-4(5)(5 - 2)
-4(5)(3)
(-20)(3)
-60

The formula for circumference is circle diameter x π:

c = πd
c = 11π

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.

8x + 6 < 1 + 6x
8x < 1 + 6x - 6
8x - 6x < 1 - 6
2x < -5
x < \( \frac{-5}{2} \)
x < -2\(\frac{1}{2}\)

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 3b = (7 x 3) (a x b) = 21ab