points for the skipped part and you will not be able to come back to the skipped part Tutorial Exercise Find the sum Use the summation capabilities of a graphing utility to verify your result Step 1 Use the following property of summation to find the sum 9i 8 i 1 Step 2 6 9i 8 i 1 Write the sum using the above property Hence n a b a i 1 Step 3 6 6 9i 8 9 i 1 i 1 6 Since 9 is a constant use the following property of summation to find the sum 9i i 1 n i 1 ka k Using the above property 6 9i i 1 9i 9 6 9i i 1 n k a i 1 n n 20 bi i 1 i 1 9 9 6 9i 189 6 9i 8 i 1 9 6 i 1 i 9 1 2 3 9 21 189 8 3 4 5 6