Given the Arithmetic series 7 + 10 + 13 + 16 + . . . + 64 What is the value of sum?

Answer 1

To find the sum of an Arithmetic series you use the equation S= n ( (a₁+a_n)/2 )

You find n by using the equation a_n=a₁+(n-1)*d. a_n=64, a₁=7, d= 3. If you plug the numbers in, your n should be 20. Plugging it back in to the sum equation, your answer is 710.