Hello
On question 2 there is a problem with the right question. Since A is different than C, when the function given has value of x equals A, that implies that A equals D and for the same line of thought when X equals C, C equals B. Which implies that when A + D = C + B = 700 all the values, A ,B ,C and D, have the same value of 350, but the question says that A is different than C.
I hope that clarified the problem.
Mr.Diogo Porfírio
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