Harita must memorize 90 measures of music for her cello solo at a concert. She plans on memorizing 18 new measures for every 3 days of practice. Which equation can be used to determine m, the number of measures
Harita still needs to memorize, as a function of d, the number of days of practice since she began learning the
piece?
Om = 72 - 150
m = 90 - 60
m = 101 - 210
m = 108 - 3d