Aprincipal of $4,000 was invested into a savings account for 5 years. if the interest earned for the period was $500 what was the interest rate? the hint is the formula for simple interest is i= prt

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

Tony is charged $ 50 and additional $0.15 per miles for renting a car. a) represent the cost of renting a car with an equation,and the determine the cost if he drove it70 miles.b) what would be the cost of a car rental if the car was driven 250 miles? show work

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?