Y= –5x + 30
x = 10
what is the solution to the system of equations?
(–20, 10)
(10, –20)
(10, 4)
(4, 10)

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

Nine more than four times a number is the same as one less than twice the number. find the number?

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