Question

Use summation notation to write the series 6.6 + 15.4 + 24.2 + ... for 5 terms

Answer 1

looks like each next term is always the same constant difference from the last term

Answer 2

try to put together something in terms of i , that will generate 6.6 for i=1, and then adds the same 8.8 to the last term every time i increases