Mathematics, 28.11.2019 23:31, Nataliepavon7

1) a soma de um número x com o dobro de um número y é de -7 e a diferença entre o triplo desse número x e o número y é igual a 7. sendo assim, determine o valor de x x y

2) em um jogo de 38 perguntas, cada competidor responde a todas elas e pode atingir, no máximo, 100 pontos. cada pergunta respondida corretamente vale 2 ou 5 pontos , dependendo da que foi selecionada. nesse jogo, o número de perguntas no valor de 5 pontos corresponde, do total, aproximadamente a:

(a) 12%
(b) 15%
(c) 18%
(d) 21%

Answers: 1

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1) a soma de um número x com o dobro de um número y é de -7 e a diferença entre o triplo desse númer...