Every day Kim does leg muscle exercises for 3/7 of an hour and foot muscle exercises for 2/3 of an hour. Which exercises does she spend the most time doing and by how much

Math i have no idea how to do a and b

0.75,1.75,2.75,3.75 is arithmetic or geometric?

Asensitive measuring device is calibrated so that errors in the measurements it provides are normally distributed with mean 0 and variance 2.00. find the probability that a given error will be between -3 and 3.