Question

help.
find the sum of the first 10 negative odd integers.

Answer 1

well you have -1, -3, -5,

so you are summing an arithmetic sequence

1st term -1 and common difference is -2 and the number of terms is 10

so substitute into the equation

\[S_{n} = \frac{n}{2}[2a + (n -1)d]\]

and evaluate

Answer 2

why start when you see me typing... so silly

Answer 3

okay thank you