What is the value of b that makes the lines, given by 3x-y=4 and 2y+4bx=1, perpendicular?

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

What is the total surface area of this square pyramid?

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