Respuesta :

It is -5 because if you take away 15 from ten you end up in the negatives so you can reverse the equation into 15-10 to get five and since we reversed it you just add a negative symbol.

10 is 90 degrees as all angles on a straight line add up to 180

11 is 42 degrees as all angles on a straight line add up to 180

12 is 138 degrees as all angles on a straight line add up to 180

13 is 42 degrees as vertically opposite angles are the same

14 is 132 degrees as i added the other two angles

15 is 138 degrees as i added the other two angles

there you go hope this helped

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