Final answer:
To express the sum of these two numbers in scientific notation, we need to add them together and make sure their exponents are the same.
Step-by-step explanation:
To express the sum of these two numbers in scientific notation, we need to add them together. The first number, 7.9 x 10^7, means 7.9 multiplied by 10 to the power of 7. The second number, 6.5 x 10^6, means 6.5 multiplied by 10 to the power of 6. To add these numbers, we need to make sure their exponents are the same. We can do this by converting both numbers to scientific notation with the same exponent and then performing the addition.
7.9 x 10^7 + 6.5 x 10^6 = 7.9 x 10^7 + 0.65 x 10^7 = (7.9 + 0.65) x 10^7 = 8.55 x 10^7
Therefore, the sum of 7.9 x 10^7 and 6.5 x 10^6 is 8.55 x 10^7.