Solve for the variable. inscribed angles, intercepted arcs

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

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

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?