Add 7.3×107+1.8×107 . Which is the correct sum?(1 point)
Responses
9.1×107
9.1 times 10 superscript 7 baseline
9.1+107
9.1 plus 10 superscript 7 baseline
9.1×1014
9.1 times 10 superscript 14 baseline
8.1×107
9.1×107
The population of a city is given as 3.45×106 . A nearby city has a population of 1.3×105 . What is the sum of the populations of the two cities in scientific notation?
To add 7.3×10^7 + 1.8×10^7, you add the numbers in front of the powers of 10 and keep the same power of 10.
Therefore, the correct sum is 9.1×10^7.
To add the numbers 7.3×10^7 and 1.8×10^7, you need to remember the rules for adding numbers in scientific notation.
1. Make sure both numbers have the same exponent. In this case, we already have both numbers expressed in scientific notation, so they already have the same exponent, which is 7.
2. Add the coefficients (the numbers in front of the "×10^exponent"). In this case, 7.3 + 1.8 equals 9.1.
3. Keep the exponent the same. In this case, the exponent remains 7.
So, the correct sum is 9.1×10^7.