Suppose that $\star(n) = \left\{n - 2, n + 2, 2n, \frac {n}{2}\right\}$. For example, $\star(6) = \{3,4,8,12\}$. For how many distinct integers $n$ does $\star(n)$ have exactly three distinct elements?

the answer to this question is yes

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers