Question

some one please helpppppppp ): <3
1.) Determine whether each sequence is arithmetic, geometric, or neither and find the tenth term. (2 pts each)
a.) 23, 27, 31, 35, 39, …

b.) -12, -5, 2, 9, 16, …



c.) -5, 15, -45, 135, -405, …










3.) After one month at a new job you decide to save $50. Each month you plan to increase your savings by five dollars.
a.)Write an explicit formula to model the amount you will save each month.


b.) How much will you save in the seventh month?

Answer 1

1.
If it is arithmetic, the difference between one term and the next is the always same, so that is easy to check.

If it is gometric, the quotient of every two neighbouring terms is always the same, so you can check that as well.

If the above don't apply, the series is neither.