Question

add
12m2,-9m, 5m ,-4m

Answer 1

Answer:

6m

Step-by-step explanation:

6m is the correct answer

Answer 2

Step-by-step explanation:

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S

10

=5[−642+252]

S_{10}= 5[-390]S

10

=5[−390]

S_{10}= -1950S

10

=−1950

Hence,

The sum of the first ten terms is -1950