7. Determine whether the sequence appears to be an arithmetic sequence. If so, find the common difference and the next three terms in the sequence.
-5, 1, 7, 13, 19,...
a.
Not an arithmetic sequence
b. Yes; common difference 7; next three terms are 26, 33, 40
c. Yes; common difference -6; next 3 terms are -35, -41, 47
d. Yes; common difference 6; next three terms are 25, 31, 37