x = 35
The angles are vertically opposite and equal thus
4x + 20 = 3x + 55
subtract 3x from both sides
4x - 3x + 20 = 55
x + 20 = 55
subtract 20 from both sides
x = 55 - 20 = 35
4a^3b^5 - 16a^5b^2 + 12a^2b^3 =
4a^2b^2 (ab^3 - 4a^3 + 3b) <==
Answer: 
Step-by-step explanation:

B is the area of the base
h is the height of the cone





