To determine which of the functions is nonlinear, we can analyze them based on their mathematical forms:
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y = 12x + 8: This is a linear function (it has the form y = mx + b).
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y = (5/8)x: This is also a linear function (it has the form y = mx).
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y = 8⋅2^(x−9): This is a nonlinear function because it involves an exponential component (the variable x is in the exponent).
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y = 5.2(7.1)^x: This is also a nonlinear function because it has a variable in the exponent.
Out of the options, y = 8⋅2^(x−9) and y = 5.2(7.1)^x are nonlinear functions. However, since you are looking for a single answer, just one of these two would suffice.
If we need to choose just one based on the provided options, let's go with:
y = 8⋅2^(x−9) as a representative nonlinear function.