This question isn't that hard but I can't seem to get the same anser as the back of the book:
Determine the sum of this arithmetic series:
20+14+8+.......-40
This is what I did:
S= 20+14+8+......-40
S=-40-34-28-........+20
6S= -20-20-20.........-20
6S=60x(-20)
=-200
Determine the sum of this arithmetic series:
20+14+8+.......-40
This is what I did:
S= 20+14+8+......-40
S=-40-34-28-........+20
6S= -20-20-20.........-20
6S=60x(-20)
=-200