Pre-Calc Help Please?

pH = log(10)1/H+ True Or False: pH = 5.8 when H+ = 10^-9.4. LI=10log10 I/Io where LI is the magnitude of sound intensity (decibels), and IO is the reference intensity which corresponds with the faintest sound that can be heard by the human ear IO = 10^-16 watts per square centimeter. Calculate the sound intensity, I, of a particular event when LI = 57.5 decibels. pH = log(10)1/H+ True Or False: H+ = 10^-5.8 when pH = 5.8.