Respuesta :

Step-by-step explanation:

2^(x + 3)

= 2^x * 2^3

= (y) * 8

= 8y.

Answer:  8y

Step-by-step explanation:

[tex]2^{x} =y\\\\2^{x+3} =2^{x} \cdot 2^{3} =y \cdot 8 = 8y[/tex]