Question

The average newborn weighs 7.5 pounds. About 4.1×106 babies are born in the United States every year. What is the approximate total weight in pounds of all the babies born in the U.S. in a year? Write the answer in scientific notation, expressed to the exact decimal place.
pounds

Answer 1

It 3.075*10^7

Answer 2

To find the total weight of all the babies born in the U.S. in a year, we can multiply the average weight of a newborn by the number of babies born.

Average weight of a newborn = 7.5 pounds
Number of babies born in the U.S. = 4.1×10^6

Total weight = 7.5 pounds/baby × 4.1×10^6 babies

Multiplying these numbers gives us:
Total weight = 31,500,000 pounds

In scientific notation, this can be expressed as:
Total weight = 3.15×10^7 pounds