Answer:
O A. {1,2,3,4,...)
Step-by-step explanation:
Its not B because it holds 0 which is ±
Add 0.5 on both sides
2X = 4.2
divide by 2 on both sides
X = 2.1
It's annuity problem
To solve your question use the formula of the present value of annuity ordinary which is
Pv=pmt [(1-(1+r)^(-n))÷r]
Pv present value?
PMT yearly payments 18000
R interest rate 0.09
N time 20 years
So
Pv=18,000×((1−(1+0.09)^(−20))÷(0.09))
pv=164,313.82
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