Respuesta :

DatGuy323

Answer: 2n+21

Step-by-step explanation:

The + 21 represents the "21 more than"  The 2n represents the "twice a number."

Hope it helps <3

altavistard

Answer:

2n + 21

Step-by-step explanation:

21 more than twice a number can be represented symbolically as 2n + 21.