Respuesta :
the sum of a number and 25 : x + 25
Nine times the sum of a number and 25 : 9(x + 25)
Nine times the sum of a number and 25 is at most -21:
9(x + 25) <= -21
Hope it helps.
It would be 9*(x + 25) <= (the sign is less than or equal to) -21