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 - 15d O m = 90 - 60 Om = 101 - 210 Om = 108 - 3d