the average newborn weighs 7.5 pounds. About 4.1\times 10^(6) 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.

Answer 1

To find the approximate 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 total number of babies born in a year:

Total weight = average weight per baby x total number of babies

Total weight = 7.5 pounds x (4.1 x 10^6 babies)

To multiply the numbers in scientific notation, we multiply the coefficients (7.5 x 4.1) and add the exponents of 10 (6+1):

Total weight = 30.75 x 10^6 pounds

Therefore, the approximate total weight in pounds of all the babies born in the U.S. in a year is 30.75 x 10^6 pounds.