From the defined function, we know that $5\star 1 = 9(5)+2(1)-(5)(1)+5= 45+2-5+5=\boxed{47}$.
Question:
If $a\star b = 9a+2b-ab+5$, what is the value of $5\star1$?
Answer:
Let's think step by step.

user
47
If $a\star b = 9a+2b-ab+5$, what is the value of $5\star1$?
test