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.)

3b(b - x)
3(3)(3 - 7)
3(3)(-4)
(9)(-4)
-36

To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

9a - 3a = 6a

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.

3z + 9 < \( \frac{z}{6} \)
6 x (3z + 9) < z
(6 x 3z) + (6 x 9) < z
18z + 54 < z
18z + 54 - z < 0
18z - z < -54
17z < -54
z < \( \frac{-54}{17} \)
z < -3\(\frac{3}{17}\)

To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

4a + 7a = 11a

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).