How do i find the mean absolute deviation?

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

What is the solution to the equation e3x=12? round your answer to the nearest hundredth

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air