Help please with math!

7. D. Obtuse

8. D. 5

9. C. 117°

Step-by-step explanation:

Step 1: Define.

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Step 2: Solve.

7. The angle presented is an obtuse angle because it is more than 90°, but less than 180°.

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Step 2 continued: Solve.

8. 140° and 8x° are supplementary angles; this means both angles have a sum of 180°.

The first step to finding 'x' is to subtract 140 from 140 and 180.

(cancels itself out)

Now we are left with:

The last step to solving this is dividing 40 by by the coefficient.

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Step 2 continued: Solve.

9. As I mentioned before, supplementary angles are two angles that have a sum of 180°.

If angle 1 is 63, then angle 2 is..

Angle 2 is 117°.

Here is an attachment to make number 8 easier to understand.

2 is the final ! : )

c. side angle side. u shares the same sides