Answer:
3 variables.
Step-by-step explanation:
b, c, and m are all variables.
QR = PR - PQ
QR = 13y + 25 - (8y + 5)
QR = 13y + 25 - 8y - 5
QR = 5y + 20 <==
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Answer:

Step-by-step explanation:


It is representing a combination form where, n is number of items we have and r is the number of items we choose from n
Here, n = 6 , r = 2

=





Thus, 