Which is the right answer??

x= 40

Step-by-step explanation:

First of all, we must make an equation. Remember that all triangles sum up to 180 degrees. So, our equation would be: 30+(3x-10)+x= 180

Step 1- Add common variables.

(30-10)+(3x+x)= 180

20+4x= 180

Step 2- Subtract 20 to both sides.

20+4x= 180

-20         -20

4x= 160

Step 3- Divide both sides by 4.

4x= 160

4      4

x= 40

Hope this helps!

your answer is a

step-by-step explanation:

4*4*4*4=256