Perimeter is equal to the sum of the four sides:

p = a + b + c + d
p = 6 + 9 + 5 + 4
p = 24

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 - 5 > \( \frac{z}{1} \)
1 x (2z - 5) > z
(1 x 2z) + (1 x -5) > z
2z - 5 > z
2z - 5 - z > 0
2z - z > 5
z > 5
z > \( \frac{5}{1} \)
z > 5

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 equation that's set to zero is to factor the quadratic equation:

c² - 9c + 18 = 0
(c - 3)(c - 6) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (c - 3) or (c - 6) must equal zero:

If (c - 3) = 0, c must equal 3
If (c - 6) = 0, c must equal 6

So the solution is that c = 3 or 6

The entire length of this line is represented by AD which is AB + BD:

AD = AB + BD