To find the combined population of North and South America in 2007, we need to add the two populations together.
Let:
- Population of North America = \( 5.15 \times 10^x \)
- Population of South America = \( 3.04 \times 10^y \)
However, since the actual exponents (x and y) are not provided in your question, I'll assume you meant:
- Population of North America = \( 5.15 \times 10^6 \) (approximation for 2007)
- Population of South America = \( 3.04 \times 10^6 \) (approximation for 2007)
To add them: \[ 5.15 \times 10^6 + 3.04 \times 10^6 = (5.15 + 3.04) \times 10^6 = 8.19 \times 10^6 \]
Thus, the combined population of North and South America in 2007 is \( 8.19 \times 10^6 \) people.
Looking at the responses:
- A: \( 8.19 \times 10^{16} \) people
- B: \( 8.19 \times 10^{9} \) people
- C: \( 8.19 \times 10^{8} \) people
- D: \( 8.19 \times 10^{64} \) people
- E: \( 8.19 \times 10^{-9} \) people
The correct answer is: C: \( 8.19 \times 10^{6} \) people, but this specific option is not listed among your provided choices, suggesting there may have been an oversight in the provided information or exponents. Please verify the initial population values or check if the exponents should be different. Based on the assumption made, the properly calculated result is \( 8.19 \times 10^{6} \).