Robert C. | Dr. Robert can help you with Math and ScienceDr. Robert can help you with Math and Sc...
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The way you have typed the problem, I am not sure which part is the exponent. I suggest that you use the caret (^) symbol to indicate the exponent. For example, if you mean e to the -420 power, you would put e^-420. Is that what you are going for?
Perhaps you could clarify your question with a comment.