Respuesta :

1)

Given data:

The given expression for the sum of a number and 2.7 is equal to 6.4.

x+2.7=6.4

x=3.7

Thus, the unknown number is 3.7.

2)

The expression for the 3 times the cost is $15.

3C=$15

c=$5.

Thus, the cost is $5.

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