Answer:
1. an=a1+(n-1)d
n=15, a1=3, d=2
a15= 3+(15-1)2
= 3+(14)2
= 3+28
= 31
15ᵗʰ term is 31
2. an=a1+(n-1)d
n=12, a1=99, d=-11
a12= 99+(12-1)-11
= 99+(11)-11
= 99-121
= -22
12ᵗʰ term is -22
3. an=a1+(n-1)d
n=16, a1= -8, d=5
a16= -8+(16-1)5
= -8+(15)5
= -8+75
= 67
16ᵗʰ term is 67
Step-by-step explanation:
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