Final answer:
Juan's calculator is displaying the result in scientific notation. '9.1E8' means 9.1 multiplied by 10 to the power of 8, which equals 910,000,000. This notation is common in disciplines that deal with very large or small numbers and on calculators that condense numbers for display.
Step-by-step explanation:
When Juan gets '9.1E8' on his calculator after multiplying two numbers, it means the result is in scientific notation, which is a way of expressing very large or very small numbers. The 'E' stands for exponent and indicates that 9.1 should be multiplied by 10 raised to the power of 8. Therefore, the answer to Juan's problem, when written out fully, is 910,000,000 (which is 9.1 multiplied by 100,000,000).
Scientific notation is particularly useful in fields like chemistry and physics where extremely precise or large values are common. Calculators often display numbers in scientific notation to make them easier to read and to work with. Understanding calculator functions is crucial for correctly entering and interpreting scientific notation. Different calculators have different ways of entering powers of 10, some with a '10^' button, some with an 'EXP' button, and others with different methods. Always consult the manual for your specific model if you're unsure how to input data correctly.