Practice for Sequences

Is the sequence arithmetic: 78, 785, 7855, 78555, ...

• Yes
• No

Is the sequence arithmetic: 37, 31, 25, 19, ...

• Yes
• No

Find the common difference: 1, 201, 401, 601, ...

• d = 100
• d = 101
• d = 200
• d = 201

Is the sequence 2, 4, 12, 48,... geometric?

• yes
• no

Find the next three terms: 4, 12, 36, 108, ...

• 324, 972, 2916
• 972, 2916, 8748
• 405, 1215, 3645

What is the explicit rule for the sequence:
11, 22, 44, 88...

• a_n = 2(11)^n-1
• a_n = 11x2
• a_n = 11(2)^n-1

find the sum of the first 25 terms in the series 7+10+13...+79

• 1050

• 2075

• 1075

• -1075