Answer:
9
Step-by-step explanation:
30 - (9+4 x 3)
30 - (9 + 12)
30 - 21
= 9
Rotation: a b
Translation:e j
Reflection over a horizontal line: g f
Reflection over a vertical line: c e
Rotation then reflection: a h
Rotation then translation: a d
I’m sorry if this isn’t right
Answer:

Step-by-step explanation:
Sure hope this helps you
V = πR²h = π*R²*3
27π = 3πR²
R² = 9
R = 3
Diameter = 3*2 = 6cm