Question

Is y=0.8(2.1)x exponential growth or exponential decay

Answer 1

The answer is: "exponential growth" .
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Given: y = (0.8)(2.1)ˣ
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Let us make a table and plug in some "x" values and see what the "y" values are:
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x | y
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1 | 1.68
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2 | 3.528
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3 | 7.4088
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The answer is: "exponential growth" .
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As "x" increases, "y" increases (by more than a linear relationship/proportion).
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Answer 2

The growth factor (2.1) is larger than 1, so the model represents exponential growth.