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the area of a rectangle is 7.7682 x 104 cm2 and the width is 2.42 x 102 cm. what is the length?

To find the length, divide the area by the width:

7.7682 x 10^4 / 2.42 x 10^2

Hen dividing scientific numbers, divide the real numbers and then subtract the exponents:

7.7682 / 2.42 = 3.21  ( since there is only 1 number to the left of the decimal point, we don't need to worry about converting it to scientific order).

4-2 = 2

The answer becomes 3.21 x 10^2 cm