In a certain series, each term is m greater than the previous term. If the 12th term is 560 and the 9th term is 500, what is the first term?	Choose the correct answer:	A) 140	B) 240	C) 340	D) 540	E) 640
a + 11m = 560 (12th term)   a + 8m = 500 (9th term)   You get a = 340 and m =   Answer: 340
<result>C</result>
In a certain series, each term is m greater than the previous term. If the 12th term is 560 and the 9th term is 500, what is the first term?