Question

Hello. Please help me with part (b)... WILL GIVE MEDALS.

http://postimg.org/image/qm02zn35z/

Answer 1

t[n]=(2n+(1+n)/10)^2
to find the sum, expand & use telescoping series

Answer 2

\[\sum_{1}^{n}(2n)+\sum_{1}^{n}(n+1)(n+1)\]

Answer 3

actually, the formula for sum(n^2) is given

Answer 4

but it is also valid for (n+1)^2

Answer 5

t[n] = (2n+(1+n)/10)^2 = .01 + .42n + 4.41n^2