Mellisa is an expert scuba diver. she's down in the pacific ocean, looking for a rare type of sunfish. at one point, she is 29 meters below the surface of the water.
a. as she swims around for the fish, she swims for 12 mins and rises upward by 15 meters. what is her final depth at the end of the 12 minutes?
b. later in her dive, mellisa is at a depth of 40 meters. she decides to rise toward the surface very slowly. every minute, she rises 2 meters. if she does this for eight minutes, what is her depth?