Check all that are equivalent to 256.

Evaluate each expression: 2⁸ = 256, 4⁴ = 4 × 4 × 4 × 4 = 256, and 16² = 16 × 16 = 256. But 128² = 16,384, so it is not equivalent to 256. The correct choices are 2⁸, 4⁴, and 16².

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