Question

arithmetic where : t10=8 and t18=-40. find the first 3 terms of the sequence.

Answer 1

8 +8r = -40
r = -6
a +9r = 8
a = 8 +54 = 62
second: 56
third: 50

Answer 2

could you explain please?

Answer 3

Well, an arithmetic sequence is one that has a start value and adds a number to that value, so it has the pattern:
a, a+r, a+2r, etc...
therefore, to find the rate when given two values in the pattern, just use that rule :D