The amount of chlorine in the water supply of a town fluctuates throughout the day. The amount of chlorine, C(t), in the water supply, measured in thousands of parts per million (ppm), t minutes after 9 a. m. is described by the function:
C(t) = 4 cost

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

If i have one apple and give you the apple, how many apples do i have?

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