If a ⊂ b, then which of the following describes the relationship between a and b? 1. set a can have the same number of elements as set b. 2. set b may have less elements than set a. 3. the intersection of sets a and b must be the empty set. 4. set b may have more elements than a does.

The answer is 4 alone, or 1 and 4, depending on how you interpret the symbol (see below for explanation).

The writing means that A is a subset of B. This means that every element of A is also an element of B, while there are elements of B that are not elments of A. For example, even numbers are a subset of natural numbers: all even numbers are natural numbers, but not all natural numbers are even.

In theory, a subset could "fill" the whole superset (and thus they are the same set), but this is indicated by the writing . Nevetheless, sometimes the two symbols are interchanged, and one writes but means .

You can think of this as the same difference between   and

So, the first point is false if you mean that A is a "strict" subset of B, while it can be true if you mean that A is generally a subset of B.

As for the second point, set B can't have less elements than set A. In this case, there would be an element in A not belonging to B, which is impossibile because B is a superset of A.

Third point: the intersection can't be the empty set (unless A is empty), because every element in A also belongs to be, and so the intersection between A and B is actually A itself.

Finally, the fourth point is true: basing on everything we said so far, B contains at least all the elements in A, and possibly some more.

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

the correct answer is $7.38

step-by-step explanation: