To add 7.3 x 10^7 and 1.8 x 10^8, we need to make the exponents of the powers of 10 the same.
We can do this by rewriting 7.3 x 10^7 as 0.73 x 10^8 (which involves dividing the coefficient by 10 and increasing the exponent by 1).
Now we can add 0.73 x 10^8 and 1.8 x 10^8:
0.73 x 10^8 + 1.8 x 10^8 = (0.73 + 1.8) x 10^8
= 2.53 x 10^8
Therefore, 7.3 x 10^7 + 1.8 x 10^8 = 2.53 x 10^8.
Add 7.3 x 10^7 + 1.8 x 10^8.
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