tell whether this pair of expressions is equivalent

the quantity x plus five divided by three
and
2/3x+5/3

Yes, these expressions are equivalent.

To show this, let's first rewrite the expression "the quantity x plus five divided by three" as:

(x + 5) / 3

Now let's simplify the expression:

(x + 5) / 3 = (1/3)x + (5/3) = 2/3x + 5/3

Therefore, the two expressions are equivalent.