2 and 5. 1 isn't apart of the list because the definition of a prime number is having 1 and itself as a factor. 1 only has the number 1.
The answer is:19.52.
Hopefully this has helped! :)
The answer is a+6b, if you want to know the proof please comment on this post
Feet, its in a larger scale, and jump ropes are long objects.
