Solve for X and Y

Sorry been having trouble understanding this

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

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