Explanation:
Using the given formula, we can substitute x = 3 and solve for y:
y = 5 x 2^x
y = 5 x 2^3 (substitute x = 3)
y = 5 x 8
y = 40
Therefore, when x = 3, y = 40.
Answer:
Plug in 3 for x
Simplify
Hence, y = 40
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