Find the area of an equilateral triangle with a 3 inch radius

Which expressions are equivalent to the one below? check all that apply. 25x/5x a. 5x b. 5 c. 5x•5x/5x d. 25x e. (25/5)^x f. (25-5)^x

What are “like terms”? why can we only add like terms?

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