we are given
airthematic sequence
we can use nth term formula

n is number of terms
an is nth term
d is common difference
a1 is first term
We are given
a7=40
we can use it



a18 = 106


we can subtract both equations



now, we can find a1

we can plug d=6


12th term:

now, we can plug values



so, 12th term is 70...........Answer
Answer:
67
Step-by-step explanation:
The correct answer is letter D
Just believe me thats the correct answer
Look at the picture.
a)
180° - 45° = 135°b) Use trigonometric function
270° - 56° = 214°