if you put what x is into the equation then solve for y then you will see that this is the answer
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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>
There are 3³ possibilities for playing 3 rounds in rock paper scissors (3 choices in every round).
Draw a tree diagram of every round and (assuming that the three choices can be played in an random order as long as they are different), the options are 6.
P(RPS)=6/27=0.22
Hope I helped :)
