Sum of square using summation notation

Question

1. For following scores find out the values of each expression:  X: 4, 2, 1, & 5. åX, åX², (åX)², å(X-1). 

Hint: This is straightforward

2. Employ the summation notation to express each of following calculations:

1. Add one point to each and every score, and then add resulting values.
2. Add one point to each and every score, square then add the squared values.
3. Add the scores and square the sum then subtract three points from squared values.

Hint: This is straightforward. You should employ the summation notation.