Answer:
a: 1/6
Step-by-step explanation:
They are linear pair of angles.
So,
107° + x = 180°
=> x = 180° - 107°
=> x = 73°
The explicit formula for a arithmetic sequence is a_n = a_1 + (n - 1)d.
We want to find a_21.
a_21 = 17 + (21 - 1)(10)
a_21 = 17 + (20)(10)
a_21 = 17 + 200
a_21 = 217
The 21st term is 217.