Respuesta :

use the points and plug em into the  form

16 = ab^(-3)
a = 16*b^3

4 = ab^(-1)
4 = 16*b^(3)*b^(-1)
b^2=1/4     b =(1/4)^(1/2)
b=0.5

check the answer choices and you see that only the third one has b = 0.5

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