Answer:
A
Step-by-step explanation:

where z is an integer



possible values of n
n= {1980, 990, 660, 495, 396, 330, 198, 180, 165, 132, 99, 90, 60, 45, 36, 30, 20, 18, 15, 5, 3}
cardinality of n=21
The solution is
(2,1)
So the value of the x-coordinate is 2
A person would have to work 9 hours to get $63
Answer:
the answer is this graph thingy
I think it would contain 0.2915 ounces of pure gold in it. sorry if my answer isnt correct