Final answer:
To express the number of days in 70 million years in scientific notation, multiply 70 million by 365 to get 25,550,000,000 days and then convert it into scientific notation as 2.555 × 10¹° days.
Step-by-step explanation:
The student is asking how to convert the number of days in 70 million years into scientific notation. Since there are 365 days in a year, we'll first calculate the total number of days in 70 million years by multiplying 70 million by 365. Next, we convert this product into scientific notation.
- Multiply 70 million (70,000,000) by 365 days to get the total days in 70 million years.
- 70,000,000 × 365 = 25,550,000,000 days.
- To express this in scientific notation, we find the first nonzero digit from the left, place a decimal point after it, and count the number of places we moved the decimal to reach this format. This count becomes the exponent of 10.
- 25,550,000,000 becomes 2.555 × 1010 as the decimal point moves 10 places to the left.
In conclusion, 70 million years is equal to 2.555 × 1010 days in scientific notation.