Find the rate of change of the line. someone please help
2 answers:
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Ans: The measure of exterior angle i.e angle A is -52⁰.
You meant to say that the measure of an angle A is on exterior angle so let me elaborate it you clearly,
We need to FOIL that out and then get it into standard form to see what our A, B, and C are. FOILing gives us 
. If we move the 7 over by subtraction and set it equal to 0, we have 
. In order to avoid a negative leading coefficient, we can change all the signs to get 
so A = 1, B = 0, C = -18, first choice above.