What is the common difference between the elements of the arithmetic sequence below?

–18, –22.5, –27, –31.5, –36

Fifty students are trying to raise at least 12,500 for a class trip. they have already raised 1,250. how much should each student raise on average in order to meet the goal? write and solve the two step inequality for this problem

Look at the figure xyz in the coordinate plane. find the perimeter of the figure rounded to the nearest tenth.

Mario and luigi were printing calendars mario used 2 1/2 ink cartridges while luigi used 1 3/4 ink cartridges .how many more ink cartridges did mario use than luigi