Write the series using summation notation
-2+1+6+13+22+...

Step-by-step explanation:

Series in Summation Notation

We must try to find a general formula for each term and then use summation to generalize the sum of all the terms for any value of n, the term number.

The series is

The difference between consecutive terms will be computed:

We can see that

Applying summation on both sides:

Knowing that

Similarly, the sum of the left side is found to be

Replacing into the above equation, we find

Solving

Having the general term, the series is expressed as

For n=0 to infinity

what are the statements

step-by-step explanation:

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .