Question

Write the sum using summation notation, assuming the suggested pattern continues. -9 - 4 + 1 + 6 + ... + 66

Answer 1

Answer:

$\sum\limits^n_{k=1} {(-14+5k)}$

Step-by-step explanation:

The series is an arithmetic series with first term (a1) -9 and common difference (d) 5. Then the general term (an) is ...

  an = a1 +d(n-1) = -9 +5(n-1) = -14 +5n

The summation notation indicates the sum of "n" of these terms.