Final answer:
The approximate number of pounds of pepperoni used on pizzas in the US each year is 252 million pounds, which is written as 2.52 × 10^8 in scientific notation.
Step-by-step explanation:
To write the approximate number of pounds of pepperoni used on pizzas each year in the US, as given by the scientific notation 2.52 × 108, we simply multiply 2.52 by 10 raised to the power of 8. This means we shift the decimal point 8 places to the right:
2.52 × 108 = 252,000,000
So, approximately 252 million pounds of pepperoni is used on pizzas in the US each year.