question  answer 
Find the common difference of this arithmetic sequence: 5, 16.5, 28, 39.5, 51...  
Find the sum of the first 80 terms of this arithmetic series: 50+48.5+47+45.5...  
Find the formula for the general term Un of the following arithmetic sequence: 2, 9, 16, 23, 30...  
Find the 47th term of the arithmetic sequence: 2, 9, 16, 23, 30...  
Is 2341 a term in the sequence 2, 9, 16, 23, 30...? Use 'yes' or 'no'  
Find the common ratio of this geometric sequence: 3, 7.5, 18.75, 46.875...  
Find the sum of the first 15 terms of this geometric series: 63+1.50.75+...  
Find the general term Un for the geometric sequence 8, 4, 2, 1, 0.5...  
Find the 12th term of the gemetric sequence 8, 4, 2, 1, 0.5...  
Is 2097152 a term in the sequence 2, 8, 32, 128... Use 'yes' or 'no'  
Is the following sequence arithmetic or geometric? 2, 5, 8, 11, 14...  
