121 ES is eleven squared
"Si es, es" is Spanish for "If it is, it is". If you just mean "si es", that means "if it is". If you mean "Sí es" (with an accent on "Sí"), it means "Yes, it is".
"Es" and "son" mean "is" and "are" in Spanish.
Es - Is
121 = eleven times eleven.
132
If, by supplement, you mean the supplementary angle, the answer is 180-121 = 59 degrees.
quis es means "who are you?"
Mañana es. = Tomorrow it is.
Es means "it" in English.
no = no and es means is
Extra Strength
"es' is not a prefix in Spanish.