arithmetic sequcences and series
the fourth term is an arithmetic sequcence -6, and the 10th term is 5.
find the common difference and the first term.
how do i go about doing this? i tried so many numbers and the closest thing i got was 1/2 for the common difference :/

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terms are
\[-6,-6+d,-6+2d,-6+3d,-6+4d,-6+5d,-6+6d=5\] solve for \(d\)

after solving d, use the same formula with n=10, a10=5, k=1 and the value of d to solve a1.

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