2) b₄/b₂=b₁*q³/(b₁q)=q²
q²=3.75/15=0.25 q=0.5
b₂=b₁q b₁=b₂/q
b₁=15/0.5=30
3) a(n)=a1+d(n-1)
22=-2+3(n-1)
n-1=(22+2)/3
n=8+1=9
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2) b₄/b₂=b₁*q³/(b₁q)=q²
q²=3.75/15=0.25 q=0.5
b₂=b₁q b₁=b₂/q
b₁=15/0.5=30
3) a(n)=a1+d(n-1)
22=-2+3(n-1)
n-1=(22+2)/3
n=8+1=9