Question

find AP of 15 terms ​

Answer 1

hence ap is 97.91,96.56,95.21........

Answer 2

Answer:

last term  = 9-5n

a+ (n-1)d = 9-5n

a+ nd - d = 9-5 n

a - d = 9 and nd = -5n⇔ d = -5  

a - (-5) = 9 ⇔ a = 4  

l = 9-5(15) = 9-75 = -66  

sum = N/2 (a+ l) = 15/2 (4-66) = -31*15 = -465

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explanation: