So to solve for r, you need to isolate the variable onto 1 side. To do that, divide both sides by 2 pi, and your answer will be 
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There is 1 way to choose none of 5. The appropriate choice is
B. 1
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C(n, k) = n!/(k!(n-k)!)
C(5,0) = 5!/(0!(5-0)!) = 1/0! = 1/1 = 1 . . . . . 0! ≡ 1.
Answer:
25
Step-by-step explanation:
Note x^2y + xy^2 = xy(x+y)
We know xy = 5 and x+y = 5, so
5*5=25