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.

2z - 8 < -3 + 7z
2z < -3 + 7z + 8
2z - 7z < -3 + 8
-5z < 5
z < \( \frac{5}{-5} \)
z < -1

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).

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 3) + (2 x 3 x 2) + (2 x 3 x 2)
sa = (18) + (12) + (12)
sa = 42

The area of a parallelogram is equal to its length x width:

a = l x w
a = a x b
a = 2 x 6
a = 12

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.

8a² - 6a² = 2a²