U(2+u) - 2u = 16 Whenever a problem presents itself with the words "what value of this variable makes this true", this means that it wants you to solve for the variable. It's the completely the same as "Solve." Now that we understand what the question is asking, we can solve for u.
u(2 + u) - 2u = 16 Distributive Property 2u + - 2u = 16 Combine like terms = 16 Subtraction of Equality ( - 16) = 0 Difference of Squares (u - 4)(u + 4) = 0 u = 4, (-4) Since you did not provide the choices, if any of the choices are (4) or (-4), then those choices are correct. Hope this helps!
no tables were provided but if a cup is 3/4 water and 1/4 citric acid and the other is 1/4 water and 3/4 citric acid then it's the second one. Basically it the one with the most citric acid.