The equation for the ph of a substance is ph= -log[h+] where h+ is the concentration of hydrogen ions. Which equation models the concentration of hydrogen ions (h+) of a solution whose ph is 7.2

Can anyone me with 32,33,36,37,and 40.

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank