Please help me i will give brainlist the first image is an example and the second is what i need help on, and please label which one is an inverse operation, solution, and checking it.

What is the range? can’t seem to find it out

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).

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.