Answer:
V = π6²6 - (1/3)π6²6
Step-by-step explanation:
Volume of a cone is (1/3) that of a cylinder with the same radius and height.
Container A volume is the volume of a cylinder minus a cone.
V = πr²h - (1/3)πr²h
V = π6²6 - (1/3)π6²6
V = 144π units³
Pythagoras Theorem:

Apply Pythagoras Theorem:
a² + 6² = 11²
a² = 11² - 6²
a²= 85
a = √85
a = 9.22 (nearest hundredth)
Answer: RT = 9.22 cm
A). 12 ÷ $7.20 = about $1.67 per muffin
b). 8 ÷ $4.40 = about $1.81 per muffin
c). 6 ÷ $4.50 = about $1.33 per muffin
type C costs the least per muffin