Answer:
C , 18
Step-by-step explanation:
1. 5n + 10d = 90
2. (18,0)
3. (0,9)
<em>a) impossible</em>
<em>b) the sum of the angles in a triangle is 180°</em>
<em>63° + 59° + 57° = 179°</em>
Answer: 234
Step-by-step explanation: 78 * 3 = 210 + 24 = 234
