Question

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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?

$m = 90 - 6d$

$m = 72 - 15d$

$m = 101 - 21d$

Explanation:

Step1: Calculate measures memorized per day

She memorizes 18 measures every 3 days. So per - day memorization is $\frac{18}{3}=6$ measures per day.

Step2: Find remaining measures formula

She starts with 90 measures to memorize. After $d$ days, the number of measures she has memorized is $6d$. So the number of measures $m$ she still needs to memorize is $m = 90-6d$.

Answer:

$m = 90 - 6d$