An adult (m) is 400 minutes less than twice a teen. How much screen time does the average adult (m) have? I need the answer to be written as an EQUATION and solved, please. FAST!!

The square root of 9x plus 7 plus the square rot of 2x equall to 7

What is the total area of the figure?

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