Answer: at lease 8 packages of Aero flight tees.
Step-by-step explanation:
At least 10 golf tees for each member of his foursome = total of at least 4*10 = 40 tees.
2 packages of the generic golf tees, that are packaged by the dozen = 2*12 = 24 tees.
So, Bill must buy at least 16 Aero tees.
This means he must buy 8 pairs
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°
Nice... you might have put the wrong picture lol