-3 im not 100% sure
sorry if its wrong
hope this helps
Answer:

Step-by-step explanation:
We are given the recursive formula:

This is the recursive formula for an arithmetic sequence.
The explicit formula for an arithmetic sequence is given by:

Where d=3 is the common difference.
We plug in this values to get:

We now expand and simplify to get:

We simplify to obtain:

Not sure what the question is, but this is 4/10 or 0.4.
Answer:
x=17
Step-by-step explanation:
Since they are intersecting lines, 3x=51
x=17