Add 7.3 * 10 ^ 7 + 1.8 * 10 ^ 7 Which is the correct sum? (1 point) O 9.1 * 10 ^ 14 © 8.1 * 10 ^ 7 O 9.1 * 10 ^ 7 O 9.1 + 10 ^ 7
The correct sum is 9.1 * 10^7. So, the answer is O 9.1 * 10^7.
To add 7.3 * 10^7 and 1.8 * 10^7, you need to remember that when adding numbers in scientific notation, the exponents must be the same.
First, let's rewrite the numbers with the same exponent:
7.3 * 10^7 + 1.8 * 10^7
Since the exponents are the same, we can add the coefficients:
(7.3 + 1.8) * 10^7 = 9.1 * 10^7
Therefore, the correct sum is O 9.1 * 10^7.
To add numbers written in scientific notation, we need to have the same exponent. Let's rewrite the numbers with the same exponent:
7.3 * 10^7 = 73 * 10^6 (since 10^7 can be written as 10*10^6)
1.8 * 10^7 = 18 * 10^6 (since 10^7 can be written as 10*10^6)
Now we can add the numbers:
73 * 10^6 + 18 * 10^6 = (73 + 18) * 10^6 = 91 * 10^6 = 9.1 * 10^7
Therefore, the correct sum is 9.1 * 10^7.