1. Find the simple interest for $800 invested at 3.2% for 4 years. 2. Suppose Felino deposited $1500 in the bank for 3 years. He makes $112.50 in simple interest at the end of the 3 years. Find the annual interest rate.
3. What is the total amount of money in an account where $4000 is invested at an interest rate of 4% compounded annually after 5 years?

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec