Here's the link to the answer.. 69.08
Answer: -4
Reasoning: so first you need to subtract the 7 from the 9 to get -2. Then you square it to get 4 because a negative 2 times -2 is 4. Then you multiply the 4 by the 2 to get 8. You can simplify the -10/5 to -1/2 and multiply that by the 8 to get -8/2 which simplified out to -4.
I hope that helps.
3. Alt. Interior Angles
4. definition of midpoint
This kind of triangle is acute triangle because on the given three angles, none of them does not exceed more than 90°.
