Lines AB and CD are parallel. If 7 measures (3x + 7)°, and 6 measures 76°, what is the value of x?

Measure of ∠6 = (3x + 7)°

Measure of ∠7 = 76°

∠6 and ∠7 are vertically opposite angles, so their measures will be equal.

Which means :

Let us now place 23 in the place of x and see if it forms 76 :

Thus, the value of x we found is correct.

Therefore, the value of x = 23

v: l•w•h÷2.

v: 20•6•8 ÷2

v: 960÷2

v: 480

only 10/60 isn't equivalent

hope this : )