5.972 × 10<span>21.
Hope this helps.</span>
Your answer should be 7/12
8n+3+9n+7=180
17n+10=180
17n=170
Answer
N=10
From the given picture, we can see that 2 sides are congruen, then the given triangle is an isosceles triangle. In this triangle the base angles are congruent, so we can draw the following picture:
Now, since interior angles of any triangle add up to 180 degrees, we have

By combining similar terms, we get

Then, x is given as

Therefore, the answer is x=90 degrees
Certain means the event will happen.
Impossible means the event would never happen.