Question

Find the 25th term of the arithmetic sequence

‒7, ‒4, ‒1, 2, ...



2. In an arithmetic sequence, if a4 = 18 and a10 = 30, determine a1, d, and an.

Then write the first four terms of the sequence.




3. In a geometric sequence, if a3 = ‒5 and a6 = 40, determine a1, r, and an.

Then write the first three terms of the sequence.

Answer 1

1.) It seems that sequence just depends on adding 3 to get the next term.
The 25th term is 65

2.) a1 equals 12
first 4 terms are 12, 14, 16, 18

3.) Couldn't figure that one.