Significant Digits and Unit Conversion

1) How many significant figures are there in the answer to the following problem? (8.881*.02100) + .590?

2) A parsec is 206,265 times the distance from earth to the sun. If the distance is 8.000 million miles, express the distance of a parsec in miles in scientific notation.

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...ng and subtracting, you always take the least number of decimal places (in this case three). Therefore, you use three significant ...