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 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.

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 7 x 6) + (2 x 6 x 5) + (2 x 7 x 5)
sa = (84) + (60) + (70)
sa = 214

A cube is a rectangular solid box with a height (h), length (l), and width (w). The volume is h x l x w and the surface area is 2lw x 2wh + 2lh.

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.

7b - 5 > \( \frac{b}{3} \)
3 x (7b - 5) > b
(3 x 7b) + (3 x -5) > b
21b - 15 > b
21b - 15 - b > 0
21b - b > 15
20b > 15
b > \( \frac{15}{20} \)
b > \(\frac{3}{4}\)