What is the diameter, in inches, of a circle that has an area of 81 pi square inches? PLEASE HELP THIS IS A TEST​

Cameron indoor stadium at duke university is one of the most revered sites in all of college basketball, as well as in all of sports period. duke’s men’s and women’s basketball programs have attained quite a few wins in the building over the last seventy years. cameron indoor stadium is capable of seating 9,460 people. for each game, the amount of money that the duke blue devils’ athletic program brings in as revenue is a function of the number of people in attendance. if each ticket costs $45.50, find the domain and range of this function.

Can someone me do math because i am having a breakdown rn because i don’t get it

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