Step-by-step explanation:

Answer:
a₄ = - 15
Step-by-step explanation:
Using the recursive formula and a₁ = 17 , then
a₂ = a₁ - 8 = 17 - 8 = 9
a₃ = a₂ - 8 = 9 - 8 = 1
a₃ = a₂ - 8 = 1 - 8 = - 7
a₄ = a₃ - 8 = - 7 - 8 = - 15
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➷ The formula for surface area of a cylinder is:

The radius is half the diameter
radius = 8/2 = 4
Substitute the values in:

Solve it:
surface area = 
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Not sure if that’s right but I hope that helps
I think the answer is the third one