A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.

The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:

x² + 14x + 36 = 2x + 4
x² + 14x + 36 - 4 = 2x
x² + 14x - 2x + 32 = 0
x² + 12x + 32 = 0

Next, factor the quadratic equation:

x² + 12x + 32 = 0
(x + 4)(x + 8) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (x + 4) or (x + 8) must equal zero:

If (x + 4) = 0, x must equal -4
If (x + 8) = 0, x must equal -8

So the solution is that x = -4 or -8

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

sa = 2πr² + 2πrh
sa = 2π(9²) + 2π(9 x 2)
sa = 2π(81) + 2π(18)
sa = (2 x 81)π + (2 x 18)π
sa = 162π + 36π
sa = 198π

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).

A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).