5 + 2x
hope this helps and give brainliest thanks !
Answer:

Step-by-step explanation:
negative + negative is positive
Number one is 12. There is 12 cubes.
In a regular polygon, all of the sides have the same length.
Pentagons have five sides. If one of the sides in a regular pentagon is 4 feet, then the rest will also be four feet. 5 sides that are all 4 feet long totals up to a 20-foot perimeter.