Answer: it might be a im not sure hope it helps GOOD LUCK!
Step-by-step explanation:
I believe the answer is t=23.48244687
Part A:SA = 3.14(rs + r^2)SA = 3.14((2)(3) + (2)^2)
Part B:SA = 3.14((2)(3) + (2)^2)SA = 3.14(6 + 4)SA = 3.14(10)SA = 31.4SA = 31.4 units^2
You would take the 38 and place over 100 since its in percent (part over whole) and then you'd place the n over 90 (part you are looking for over whole)
so.....the 3rd one is correct