Identify the 27th term of an arithmetic sequence where a1 = 38 and a17 = –74

Question

anonymous · Answer

The process: A geometric sequence means that the general term is given by the following expression for some constant $C$. 
$$\Huge a_n=a_1\cdot C^{n−1}$$
Use this information to reason out the value of $C$ (the ratio between terms), and plug in $n=27$.

asnaseer · Answer

yakeyglee: this is an arithmetic sequence, so the formula for the n'th term is:$$a_n=a_1+(n-1)d$$where $a_1$ is the first term and $d$ is the common difference between each term.