Answer: 
Step-by-step explanation:
By definition, the sum of the interior angles of a triangle is 180 degrees.
Based on this, you need to set up the following equation:

The next steo is to solve for "x" in order to find its value. This is:

You can observe in the picture of the triangle ABC given in the exercise, that:

Therefore, you must substitute the value of "x" into that equation and then evaluate, in order to find the measure of the angle B. This is:

ANSWER:
It will be like this 3^10/3^4
=(3)^10-4
=(3)^6
Law used x^m/x^n=x^m-n
HOPE IT HELPS!!!!!
PLEASE MARK BRAINLIEST!!!!
Answer:
96 degrees
Step-by-step explanation:
you have two angles that each measure 42 degrees, giving you 84 degrees combined
there are 180 degrees in a triangle, therefore the vertex angle is equal to 180 minus 84, or 96 degrees
check:
42 + 42 + 96 = 180
180 = 180