Find the coordinates of c after 90 degrees clockwise rotation around the origin

Ineed me i stuck and i don’t want to get it wrong

What is the radical expression that is equivalent to the expression 27 1 over 5?

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