Uma lanchonete vende dois tipos de sanduíche: o simples que contem uma fatia de carne, 1 fatia de queijo e uma fatia de presunto e o duplo, que contém duas fatias de carne, 2 fatias de queijo, 1 fatia de presunto, tomate e alface. se alguém comprar quatro sanduíches simples e cinco duplos pagará r$ 105,00. se comprar cinco sanduíches simples e sete duplos pagara r$ 138,00. qual é o preço de cada sanduíche?
socorro não sei como se faz isso

Im literally having a mental breakdown

Abcd is a square. what is the measure of angle bac

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.