Devon's target heart rate zone is 140bpm—177bpm. julian's target heart rate zone is 148bpm—181bpm. they stop running and take their pulse, and both count the heart rate at 173bpm. if they decrease their heart rates by 20bpm, who will be in his thr zone? both devon and julian neither devon nor julian devon only julian only

Both Devon and Julian will have reached their THR zones.

Ithink the answer is c

See diagram.we use washers to get the area and we will be integrating with respect to xouter radius is the  distance between y = e^x and y = -1    inner radius of washer is the distance between y = 1 and y = -1    the area of one cross-section of a washer is    solid lies between x = 0 and x = 2. the volume is    if you need this expanded, then    the question doesn't say to evaluate, so we're done.