The mathematical expression 2 ∈ v means:

The mathematical expression 2 ∈ V means that:

        2 is an element of set V.

We know that for any set A with elements as:

            A={a,b,c,d}

We see that that the element a,b,c and d all belongs to the set A and is represented by the symbol:

          a ∈ A, b ∈ A , c ∈ A and d ∈ A

i.e. they represent that the element is contained in that set.

Here we  2 ∈ V

This means for a set V of elements.

The element 2 belongs to the set.

i.e. it is a member of the set.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)