6. 21 and 22 form a linear pair. If mZ1 = (5x + 9)* and m2 = (3x + 11)", find the measure of each angle.
Help please!!!

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Someone answer asap for ! 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

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0