In the hall it is necessary to arrange in rows 72 chairs. at what size, 6 chairs or 8 chairs in the hall will have fewer rows and how much less? solve by aligning the line completely

correct answer:

a + bi

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.