Question

1. Determine the 20th term of the series 15.6, 15, 14.4, 13.8,…

Answer 1

good morning...

here is your answer.....

first term (a) = 15.6

common difference (d) = 15-15.6 = -0. 6

n= 20

so, 20th term= a+(n-1)d = 15.6+19*-0.6 = 15.6-11.4 = 4.2

hope it helps.

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Answer 2

A.P.=15.6,15,14.4,13.8....

a=15.6 d= 15-15.6=-0.6,n=20

t20=a+(n-1)d

=15.6+(20-1)*-0.6

=15.6+19*-0.6

=15.6-11.4

=4.2

hence 20th term is 4.2