System of Equations need help solving

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.

The track team ran a mile and a quarter during their practice how many kilometers did her team runs?