add 7.3 * 10^7 + 1.8 * 10^7

Answer 1

This can be simplified by adding the numbers in scientific notation:

7.3 * 10^7 + 1.8 * 10^7 = (7.3 + 1.8) * 10^7
= 9.1 * 10^7

Therefore, 7.3 * 10^7 + 1.8 * 10^7 equals 9.1 * 10^7.