Answer:

Step-by-step explanation:
Equation: 
1).
→
2).
∴ 
3). 

4). now plug
into 


5). Minimum (0,-5) ∴ 
Answer:
| 157 +/- 145 |
Step-by-step explanation:
302-12 = 290 total range
290/2 = 145 absolute value range
| 157 +/- 145 |
The two answers to that are 12 and 301
F - 3/4 = 5/6
Add 3/4 to both sides to get
F = 5/6 + 3/4 = 19/12
Your good its 80 one way you can always tell if its a triangle is if all the angles add up to 180