Answer:
the answer is A or F (both are the same answer which is 40)
You know angles B and C are both 60°, the values of the angles in an equilateral triangle. Since the sum of angles in a quadrilateral is 360°, you have
B + C + x + y = 360°
60° +60° + x + y = 360°
x + y = 240°
(8c)^2+7c
(8c)^2=64c^2
so that..
64c^2+7c
factor out c
c(64c+7)
Well first x =1 so i multiplied 1 and 2 to the second power then added 4 and i got zero. next i done the same with x and 2 but after i minsed it from 6x whih is just 6 then added that from 1 and i got zero so in the ebd my whole answer i ended up with zero
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