Add 7.3×107+1.8×107 . Which is the correct sum?

Answer 1

To add \( 7.3 \times 10^7 \) and \( 1.8 \times 10^7 \), you can simply add the coefficients since they have the same power of ten:

\[ 7.3 + 1.8 = 9.1 \]

Now, combine this with the common power of ten:

\[ 9.1 \times 10^7 \]

Thus, the correct sum is:

\[ 9.1 \times 10^7 \]