Average rate of change from f(x)=-2x+1 from x=5 to x=1

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212