Nadia built a robot to filter air and water efficiently she expects the robot to filter more than 343 liter of air and water while using less than49 joules if energy

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

What is the absolute value of the complex number -4-sqrt2i

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?