On a test that has a normal distribution, a score of 7 falls three standard deviations below the mean, and a score of 31 falls one standard deviation above the mean.
Determine the mean of this test.

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

Multiply. write your answer in simplest form. 3/8 x 5/7