Question

Am I doing this right? I'm really confused

Answer 1

Everything is right until the 3x +90=180

you want to subtract 90 to get:

3x=90

the divide by 3

x=30

So the measure for angle t would be 60 degrees

Answer 2

Your first two lines are beautiful. That's exactly
the right way to approach this:

2x + 90 + x = 180

3x + 90 = 180 .

But then I don't know what your third line means,
or even where it came from.

Here where you need to go after the first two lines:

(second line) . . . 3x + 90 = 180 .

Then, subtract 90 from each side: 3x = 90

Divide each side by 3 : x = 30

Angle ' T ' = 2x = 60 degrees.

Angle ' V ' = x = 30 degrees.

Check: 60 + 90 + 30 = 180 degrees yay !