Respuesta :
Answer: L = 15 -2-4
Step-by-step explanation:
Hi, to answer this question we have to subtract the letters that they have already written (2 and 4) to the total number of letters they have to write (15). That expression must be equal to the number of letters they left to write (L)
Mathematically speaking
L = 15 -2-4
Feel free to ask for more if needed or if you did not understand something.