Question

Write the sum using summation notation, assuming the suggested pattern continues.

-9 - 4 + 1 + 6 + ... + 66

1. summation of negative forty five times n from n equals zero to fifteen
2. summation of the quantity negative nine plus five n from n equals zero to fifteen
3. summation of the quantity negative nine plus five n from n equals zero to infinity
4. summation of negative forty five times n from n equals zero to infinity