which of the following sets are equal to {x | x > 9 and x < 2}
{2, 3, 4, 5, 6, 7, 8, 9}
{ }
{3, 4, 5, 6, 7, 8}
{3, 4, 5, 7, 8}
{4, 5, 6, 7, 8, 9}

  { }

Step-by-step explanation:

There are no numbers that are both greater than 9 and less than 2. The expression describes the empty set.

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