2.A business invests $8000 in a savings account for two years. At the beginning

2.A business invests $8000 in a savings account for two years. At the beginning of the second year an additional $2500 is invested. At the end of the second year the account balance is $11445. What was the annual interest rate? 3.Steve traveled 150 miles at a certain speed. Had he gone 20mph faster the trip would have taken 2 hours less. Find the speed of his vehicle. 4.The Hudson River flows at a rate of 5 miles per hour. A patrol boat travels 40 miles upriver and returns in a total time of 6 hours. What is the speed of the boat in still water?