Answer:
60+80+x=180
Step-by-step explanation:
__ + __ + __ = __ fill in the blanks
if 60, 80, and y have a sum of 180, the equation is 60+80+x=180
Answer:

Step-by-step explanation:
The generating function a(x) produces a power series ...

where the coefficients are the elements of the given sequence.
We observe that the given sequence has the recurrence relation ...

This can be rearranged to ...

We can formulate this in terms of a(x) as follows, then solve for a(x).

The generating function is ...
a(x) = 1/(1+2x)
15 cards = 9$
1 card = (9/15)$
12 cards = 9/15 * 12
= 108/15
= 7.2$
91/100 is already in simplest form
9.) 3
10.) 1
11.) x-axis
12.) 4
13.) y-axis