hey guys, im having a bit of trouble with some questions.

Hopefully someone can help me out.

1. ∑[i=1 to n]Xi

where X = {8,10,9}

2. ∑[i=1 to 3] (Xi + a)Yi

Where X = {8,10,9}

Y = { 108, 101, 103, 94}

and a is a constant... a = 11

Hopefully the format of the question makes to everyone, it wouldnt let me copy and paste the proper format.

Thanks to anyone who helps!