Abcd is a parallelogram. find the values of x and y. solve for the value of z, if z=x−y.
a. -10
b. -20
c. 20
d. 30

C

Step-by-step explanation:

Parallel and opposite sides of a parallelogram are equal. Hence, we can say:

x + 30 = 2x - 10

and

2y-10 = y +10

Solving first one, we get:

x + 30 = 2x - 10

30+10 = x

x = 40

Also

2y - 10 = y + 10

y = 10 + 10

y = 20

Now, z = x - y, so

z = 40 - 20 = 20

Answer C is right.

cant open file sorry!

step-by-step explanation:

it’s the first one your welcome