4. (4pt) Refresher on Summation Notation. Evaluate each of the following: a. 10 x=5 X/nb. C. d. When k is a constant: 15 Σk x=1 When k is a constant: 3

[(kx² + 2) x=0 Let f(x) = 10 Compute: 3 ΣX₁ x=0 (x+1 for x = 0,1,2,3 xf (x) 0 otherwise