Julie is 12 ounce of cheese in her potato soup recipe yields 8 servings and Julie needs enough for 20 servings how many pounds o
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You can do C(6,2) which gives 
which is 15!
The square of a binomial expands as follows:
Expanding all the binomials, we have
Sum like terms:
Simplify terms appearing on both sides:
Move all terms involving k to the left and all numbers to the right:
Divide both sides by -20: