The surface area of a cylinder is 2πr² + 2πrh:

sa = 2πr² + 2πrh
sa = 2π(6²) + 2π(6 x 6)
sa = 2π(36) + 2π(36)
sa = (2 x 36)π + (2 x 36)π
sa = 72π + 72π
sa = 144π

The formula for circumference is circle diameter x π:

c = πd
c = 5π

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 5 x 3) + (2 x 3 x 6) + (2 x 5 x 6)
sa = (30) + (36) + (60)
sa = 126

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.

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 equal sign and the answer on the other.

7y - 1 = \( \frac{y}{-4} \)
-4 x (7y - 1) = y
(-4 x 7y) + (-4 x -1) = y
-28y + 4 = y
-28y + 4 - y = 0
-28y - y = -4
-29y = -4
y = \( \frac{-4}{-29} \)
y = \(\frac{4}{29}\)