ANSWER

EXPLANATION
The given angle is 870°.
870°-360°-360°=150°
This means that:
870° is coterminal with 150°, hence its terminal side is in the second quadrant.
It makes an acute angle of 30° with the x-axis.
Note that cotangent is negative in the second quadrant,
Hence,

The first option is correct.
Answer:
(0,9.8) and (10,1.2)
Step-by-step explanation:
it makes the best line
Answer:
1000
Step-by-step explanation:
Answer:
It's B.9
Step-by-step explanation:
Because
11+9=20
20+9= 29
29+9= 38
The common difference is positive because the arithmetic sequence is increasing.
25÷100=0.25
0.25×n=the percentage
Or 0.25n
Or 0.25•n