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**Summation Problems! Please Help!**

My geography prof assigned these... believe it or not. Its a quiz and its worth 5% of our mark.

1) Σi^4 = 1^xi Variables - n=4 x1=1 x2=6 x3=9 x4=17 (i think its 4)

2) (Σi^4=1^xi)^2 n=4 x1=3 x2=10 x3=9 x4=12 (i think this one is 4 also)

3) Σi^2= 1Σj^2 = 1^xij n=2 m=2 x11=2 x12=12 x21=4 x22=17 (i havent the faintest idea...)

4) Σi^3= 1 xi/2 n=3 x1=3 x2=16 x3=6 (i think this one is 12.5)

5) Σi^n=1 xi/zi n=3 x1=14 x2=19 x3=16 z1=4 z2=9 z3=6

(i think the answer is apprx 8.28)

I have no idea why my geography teacher is giving us this quiz... i am not a math major. I have to round all answer to 2 decimal places if rounding is possible in the solution. I dont require the work as its an online quiz. But if u want to include it, all the better.

Thanks in advance.