What is the perimeter of a parallelogram if it has a base width of 3x+9 and it has a height length of 4x-5?

So basically the perimeter of a parallelogram is

2*length + 2*width

Or, in this case, once you substitute everything in,

2 * (3x + 9) + 2 * (4x - 5)

Use the distributive property, to distribute the 2s to everything inside the parenthesis.

2 * 3x + 2 * 9 + 2 * 4x + 2 * - 5

6x + 18 + 8x - 10

Then just add everything

14x + 8 = perimeter