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?
a. m = 72 – 15d
b. m = 90 – 6d
c. m = 101 – 21d
d. m = 108 – 3d
