What is the 30th term of the arithmetic sequence?
15, 11, 7, 3, -
a.) 131
b.) -5
c.) -101
d.) -105

C.

Step-by-step explanation:

We have the arithmetic sequence 15,11,7,3,-1,...

Where,

You can see that the common difference d=(-4), or if you couldn't see the common difference you can calculate it with the formula:

Then,

Now to find the 30th term of the arithmetic sequence we can use the following formula:

Replacing n=30, and d=(-4):

Then the correct option is C.

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)