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

-4 + 5 + 14 + 23 + + 131

Thank you for posting your question here. Below is the sum of the pattern above using the summation notation. 

4 + 5 + 14 + 23 +...+1 31 = ∑n=015(−4)+n⋅9

Summation Notation. Often mathematical formula require the addition of many variables Summation or sigma notation is a convenient and simple form of shorthand used to give a concise expression for a sum of the values of a variable.

On monday,mrs.wise bought 3 lbs of apples at $4per lb= 4*3=$12on tuesday ,20%off and she buy 5 lbs of apples = $4-20%=3.20*5lb=$16example: other wise when she buy 5lbs on monday she have to spend 4*5=20