1ª)Determine o valor numerico das expressoes algebricas :?

a) 7x +2y ,quando x=4 e y= 6

b) x² + 3-15,quando c=5

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2ª)O valor de x na proporçao x:8 = 5:20 é :

a)1 b) 2 c) 3 d) 4

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