3 years ago

sum of the 5th and 10th terms of an arithmetic sequence which are equal to the 20th term (80). find the 30th term

Mathematics

1 answer:

inysia [295]3 years ago

8 0

Yo sup??

a5=a+4d

a10=a+9d

a20=80=a+19d

a+4d+a+9d=a+19d

a=6d

80=6d+19d

80=25d

d=3.2

a=19.2

a30=a+29d

=19.2+92.8

=112

Hope this helps.

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