Question

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?
options:

• ( m = 72 - 15d )
• ( m = 90 - 6d )
• ( m = 101 - 21d )
• ( m = 108 - 3d )

Explanation:

Step1: Find daily memorization rate

$\text{Daily rate} = \frac{18}{3} = 6$ measures/day

Step2: Define remaining measures

Remaining measures = Total measures - (Daily rate × Days)
$\boldsymbol{m = 90 - 6d}$

Answer:

m = 90 - 6d (the second option)