Let ak= 3^k,

bk=5k-3 and

ck= ak+bk

=3^k +5k-3

a/ which type of sequence is ak and write out a formula for the value of a1+a2+...+an.

b/ which type of sequence is bk and write out a formula for the value of b1+b2+...+bn.

c/ write out formula for c1+c2+...c10.

I am very unsure about how to answer this question.. can somebody help me please?