Question

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

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

Answer 1

5n-14

Answer 2

But the answer choices are
summation of negative forty five times n from n equals zero to fifteen
summation of the quantity negative nine plus five n from n equals zero to fifteen
summation of the quantity negative nine plus five n from n equals zero to infinity
summation of negative forty five times n from n equals zero to infinity