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Answer:
3x+35°-10
Step-by-step explanation:
remove the parentheses so the equation is
x+ 15°+x+20°+(x-10)
66 degrees
Thing you have to know for these types of problems: The total measure of all angles is 180 degrees.
With that in mind, if we add 83 and 31, we get 114 degrees.
Now subtract from 180 and you will get 66 degrees.
Hope this helps, Please mark branliest if it did
Answer:
17
Step-by-step explanation:
If in a 7 sided polygon 4 diagonals can be drawn then as you increase the number of sides you increase the number of diagonals
8 sides
5 diagonals and so on