X=20
WORK:
100+ 3x +x=180
4x+100=180
-100 -100
4x=80
divide both sides by 4
x=20
1,4,5,6 the b value of the y-intercept
Working backwards:
17-3=14
14/2=7
7 is the second term in the sequence. Continue backwards.
7-3=4
4/2=2
2 is the first term in the sequence, aka your answer.
C I need to put 20 letters so yea the answer is C