Question

Evaluate the series:

Enter a numerical answer only.

Answer 1

you have only five numbers to add, so you can do it without any formula

Answer 2

\[2\times 4-1+2\times 5-1+2\times 6-1+2\times 7-1+2\times 8-1\] is your addition

Answer 3

or
\[2(4+5+6+7+8)-5\]

Answer 4

thanks

Answer 5

yw