Answer:
z = 7
Step-by-step explanation:
Based on the midsegment theorem of a triangle, the length of the midsegment of the triangle (z) = ½ of the length of the 3rd side of the triangle (14)
Thus:
z = ½(14)
z = 7
The discriminant is

which is 0.
Since the discriminant is 0, there is only one real solution.
It contains one significant digit and the rule for this one is that leading zeros in fractions less than one are not significant.
Answer:
The last one is the correct answer.
Step-by-step explanation: