CPM Homework Help : CALC Problem 3-33

Expand and evaluate the following sums.

$\displaystyle\sum _ { i = 2 } ^ { 6 } ( 3 i )$
Answer (a):
$=3( 2+3+4+5+6)=3(20)=60$

$\displaystyle\sum _ { i = 1 } ^ { 10 } ( 5 + \frac { 1 } { 2 i } )$
Hint (b):
How can this sum be rewritten to save you time?