Afootball stadium holds 17,700 seats. the lowers level has 300 seats less than 4 times the number of seats in the upper level. the middle level has 500 more seats than twice the number of seats in the upper level. witch equation can be used to find the number of seats in the upper level. a.) 7x+200=17’700b.) 6x+200=17,700c.) 7x-200=17,700d.)6x-200=17,700