What is the surface area?
5 mm
6 mm
5 mm
5 mm
4 mm

square millimeters

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

the correct answers i think are b. and d.

give me brainliest if it is correct!

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.