For numbers 10-12, please refer to the figure below.

10. What is the value of y?
a. 25
b.30
c.35
d.40

11. What is the measure of the congruent base angles?
a.63°
b.67°
c.73°
d.77°

12. What is the length of the median?
a.5 cm
b.9 cm
c.14 cm
d.28 cm​