Question

!!!CALCULUS!!! 20 POINTS

Find the first term of the arithmetic sequence in which a_27=-1/2 and the common difference is 2.
103/2
-105/2
-103/2
111/2

Answer 1

-1/2=a_1+26*2
-1/2=a_1+52
a_1= -1/2-52
a_1= (-1-104)/2
a_1= -105/2