How many permutations of 4 different letters are there, chosen from the twenty six letters of the alphabet?

What is the definition of exponential decay?

On a piece of paper graft y+2> -3x-3 then determine which answer matches the graph you drew

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?