What is the number 7.3×10−8 written in decimal notation?

7.3×10−8 written in decimal notation is 0.000000073.

To write the number 7.3×10^(-8) in decimal notation, you can move the decimal point 8 places to the left. Starting from the given number, we have:

7.3 × 10^(-8) = 0.000000073

To write the number 7.3×10^(-8) in decimal notation, you need to move the decimal point to the left by 8 places, correspondingly to the negative exponent.

Start with the number 7.3 and move the decimal point 8 places to the left (because the exponent is negative).
Since there are no other digits after the decimal point in 7.3, you need to add zeros as placeholders as you move the decimal point.

Moving the decimal point 8 places to the left gives us: 0.000000073.

So, the decimal notation for the number 7.3×10^(-8) is 0.000000073.