Given are the first three terms of a sequence that is either arithmetic or geometric. If the sequence is arithmetic, find a1
and d. If a sequence is geometric, find a1 and r.
-$10,15,20 , \ldots$
A) $\mathrm { a } _ { 1 } = 10 , \mathrm {~d} = 15$
B) $a _ { 1 } = 10 , d = 5$
C) $\mathrm { a } _ { 1 } = 10 , \mathrm {~d} = - 5$
D) $a _ { 1 } = 10 , r = 5$

Question

Quizplus · Accepted Answer

The given sequence is arithmetic because each term increases by a constant amount. The first term $a_1$ is 10, and the common difference $d$ is 5 (15 - 10 = 5).

Given Are the First Three Terms of a Sequence That 10,15,20,…10,15,20 , \ldots10,15,20,…

Given Are the First Three Terms of a Sequence That $10,15,20 , \ldots$