Which expression represents the phrase, "one third the sum of 12 and a number"?

Let

x--------> the number

we know that

1) the phrase, "the sum of 12 and a number"

represent the expression -------->

and

2) the complete phrase, "one third the sum of 12 and a number"

represent the expression -------->

therefore

the answer is

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base

2, 2, 2 or -4, 20, 29

step-by-step explanation:

there is two ways you can do it.