3(x-1)+7x=27 how do you do it step by step?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

How do i find the missing angle measure in a polygon

Which choice has the correct steps in graphing the solution set to the following inequality? -45_> 20x-5y