Responda essas 4 contas com o calculo que dou 5 estrelas e marco como melhor resposta (Pfv é pra esse fim de semana) (- 4/3) : ( - ½) =
( -4,0) : ( 1/5) =
( ¾) . (3/4 ) + ( ( 2/3) . (2/3) . (2/3) ) = -2
( 3/8) = -4c) (2) = -2d) ( -2/3) =
Estou preso nessas 4 e eu seria muito grato se alguem puder me ajudar obrigado :)

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?