Por favor ayuda cuanto es 50=t-1?

The parabola opens: y=√x-4 (principal square root) up down right left

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom