Given are the first three terms of a sequence that is arithmetic. Find a1 and d.
-$9,13,17$
A) $a _ { 1 } = 9 ; d = 12$
B) $a _ { 1 } = 9 ; d = 9$
C) $a _ { 1 } = 9 ; d = 4$
D) $a _ { 1 } = 9 ; d = 3$

Question

Quizplus · Accepted Answer

The first term $a_1$ is 9, as it is the first number in the sequence. The common difference $d$ is found by subtracting any term from the subsequent term, $13 - 9 = 4$, thus $d = 4$.

Given Are the First Three Terms of a Sequence That 9,13,179,13,179,13,17

Given Are the First Three Terms of a Sequence That $9,13,17$