`a_3 = 19, a_15 = -1.7` Write the first 5 terms of the arithmetic sequence.

Expert Answers

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Let `a_1`  be the first term and d be the common difference of the sequence.


`a_1+14d=-1.7`   ---------- (1)


`a_1+2d=19`         ----------- (2)

Now let's solve the equations 1 and 2 to get the `a_1` and d,

Subtract equation 2 from equation 1,





Plug the value of d in equation 2,

















So the first five terms of the sequence are 22.45,20.725,19,17.275 and 15.55

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