Arithmetic Sequences and Series Quiz

Which of the following are arithmetic sequences?

•  $1,\ 3,\ 5,\ 7,\ 9,...$  

•  $1,\ 2,\ 4,\ 8,\ 16,...$  

•  $10,\ 7,\ 4,\ 1,\ -2,...$  

•  $0.5,\ 0.75,\ 1,\ 1.25,\ 1.5,...$  

•  $-1,\ 2,\ -3,\ 4,\ -5,...$  

What is the common difference of this arithmetic sequence?

 $15,\ 7,\ -1,\ -9...$  

Find the tenth term of the sequence $a_n=3n-8$  

Find  $k$  if  $2k$  ,  $k+1$  and  $k+8$  are all consecutive terms of an arithmetic sequence.

Insert five numbers between -5 and 13 so that all seven numbers are in arithmetic sequence.

Find the general term $u_n$ for an arithmetic sequence with $u_3=9$ and $u_7=29$ .

 Find the sum of the series $3+7+11+15+...$ to 15 terms.

Find the sum of $50+48+46+...+\left(-12\right)$