Precalculus Final Exam 2020

Classify whether the following list is an arithmetic or geometric series AND what the

common difference or common ratio is.

• Geometric sequence, r = -20

• Arithmetic sequence, d = -20

• Geometric sequence, r = 20

• Arithmetic sequence, d = 20

Find the 10^th term of the following geometric sequence.

• $a_{10}=10$

• $a_{10}=100$

• $a_{10}=512$

• $a_{10}=-17$

Classify whether the following list is an arithmetic or geometric series AND what the common difference or common ratio is.

• Arithmetic, d = 5

• Geometric, r = -5

• Arithmetic, d = -5

• Geometric, r = 5

Find the 57^th term in the arithmetic sequence.

• 
  

  $a_{57}=913$
  

• $a_{58}=913$

• $a_{57}=-913$

• $a_{58}=-913$

Find the common difference for the arithmetic sequence.

• d = -30

• d = 30

• d = -20

• d = 20

Find the common ratio for the geometric sequence.

• r = 4

• r = -4

• r = 2

• r = -2

Determine if the sequence is geometric or arithmetic AND find the corresponding common ratio or common difference.

• Arithmetic, d = -6

• Geometric, r = 5

• Arithmetic, d = 5

• Geometric, r = -6

      

•  $a_{2014}=4+1066\left(2013\right)$  

•  $a_{2014}=1066+4\left(2013\right)$  

•  $a_{2014}=1066\left(4\right)^{2013}$  

•  $a_{2014}=4\left(1066\right)^{2013}$  

 

•  $a_{83}=-6$  

•  $a_{83}=82$  

•  $a_{83}=1555$  

•  $a_{83}=1558$  

Find the sum of the first ‘n’ terms of the arithmetic series.

• -1947

• 1947

• -1957

• 1957