The quantities that are not constant in uniform circular motion are :
1. Angular Velocity , the direction keep changing in angular velocity so it's not constant
2. Angular position, theta will keep on changing until it reach 360
3. Direction of centripetal acceleration
hope this helps
The x terms add up to 4x and the numbers add up to 12
4x + 12 = 4(x + 3)
Its C
6, 12, 18
..................
H + 121 + 31 = 180
H + 152 = 180
H = 180 - 152
H = 28