Answer:
120
Explanation:
Hey There!
In a parallelogram opposite angles are equal to each other
the first step in this problem is to find the value of angle D and angle B
To do so we set up an equation
6x+6=10x-30
step 1 add 30 to each side
-30+30 cancels out
6+30=36
now we have
6x+36=10x
step 2 subtract 6x from each side
10x-6x=4x
6x-6x cancels out
now we have 4x=36
step 3 divide each side by 4
4/4 cancels out
36/4=9
so x=9
now we plug in the values of x
9x10=90
90-30=60
angle C and angle B are supplements meaning that they add up to equal 180
so in order to find angle C we subtract the given angle (60) from 180
180-60=120
so angle C=120