The equation for the ph of a substance is PH equals negative log H +, where H + is the concentration of hydrogen ions. What is the approximate ph of a solution if the concentration of hydrogen ions is 5.1 × 10 to the power of negative for moles per liter

Ineed with number 17 i don’t get it at alll

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

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