An old movie theater has seats on a main floor and in a balcony. the main floor has 26 rows of 29 seats in each row. the balcony has eight rolls of 23 seats in each row. how many more seats are on the main floor then in the balcony

The main floor has 26 rows of 29 seats each, that is 26*29 = 754 seats  
And in the balcony there is 8 rolls of 23 seats, that is 8*23 = 184 seats  
So the difference is 754 - 184 = 570   
Then the main floor has 570 seat more than the balcony

You need to divide 210 square inches by 35 inches and that’s going to give you 6 inches and that’s the length of the hypothenuse of the right triangle i hope that this you : )