What is the slope of a line perpendicular to the line y=2x+5 ?

Can you simplify 4/7? 24 points will be awarded!

For each proportion find the unknown number x 1/5/8=×/15

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