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0 3/14 4/7
That's an isosceles triangle lying on its side. The base angles (on the left) are marked equal, so we know the sides opposite them are equal.
That means that . . . x+4 = 3x-8
Subtract 'x' from each side . . . 4 = 2x-8
Add 8 to each side . . . 12 = 2x
Divide each side by 2 . . . <em>6 = x</em>
-7 is the value of discriminant for this equation.
Let's round the numbers into perfect roots. So 23 rounded would be 25, because the square root of 25 is 5, and 47 rounded is 49, because the root of 49 is 7. So 7-5=2. That would be the best approximation for this question.
In total, 14 people like cake (10+4).
4 of those 14 also like pie.
4/14= 2/7
Final answer: A