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%

Micah solves a linear equation and concludes that x = 0 is the solution. his work is shown below. (1 – 3x) = 4(– + 2) 0 = x which statement is true about micah’s solution?

Acable company wants to provide cell phone service for residents on an island. the function for the cost of laying the cable from the island to the mainland is c(x)= 6.500 square root x2+4, where x represents the length of the cable in feet. what are the domain and range of the function? a) domain: all real numbers range: all real numbers greater than or equal to 17,000 b) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 17,000 c) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 13,000 d) domain: all real numbers greater than or equal to 13,000 range: all real numbers greater than or equal to 0

What is the slope of the line shown below?