Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Harita still needs to memorize, as a function of d, the number of days of practice since she began learning the piece <span>m = 90 - 6d</span>
84 because 36 x 2 =72 and then 1/3 of 36 is 12 and 12+72=84
Answer:
it should be A and if it is not a then b but I think A
