How many different keys can be made for a lock that has 8 tumblers with 4 possible heights each? 4^8 does not work. is there something i am missing?

What is the vertex form of f(x) = x2 + 6x + 3

Which value would be a solution for x in the inequality 47-4x< 7

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !