How Gauss Did It 1 + 2 + 3 + . . . + n =

2. Triangular Numbers Tn = 1 + 2 + 3 + . . . + n =

3. Sum of Squares (understand how to find the sum using the proofs in both parts)

12 + 22 + 32 + . . . + n2 =

7. Exponential Sums (Do parts a and b only)

a) 2 0 + 21 + 22 + 23 + . . . + 2n–1 =

b) a 0 + a 1 + a 2 + a 3 + . . . + a n–1 =

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

answer: h=5.6 i don't really know how to put into words, so i though i would let you do that. i hope i was able to some

step-by-step explanation:

18 = 6(h)+1/2

18 = 6h+1/2

18-1 = 6h/2

17 = 3h

17/3 = h

h = 5.6

35/2 is it i think maybe