Math Question

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TIME REMAININ \( 53: 59 \)
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?
\( m=72-15 d \)
\( m=90-6 d \)
\( m=101-21 d \)
\( m=108-3 d \)



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