Each group of three digits separated by commas in a multi digit number

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year