Question

which term of the sequence -3,5,13,....,is 125

Answer 1

an=a+(n-1)d
125=-3+(n-1)8
128=(n-1)8
16=n-1
n=17=term of sequence is 125

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Answer 2

an=a+(n-1)d
125=-3+(n-1)8
128=(n-1)8
128÷8=(n-1)
16=(n -1)
n=16-1
n=15