The pH can be calculated using the equation pH = –log(H+), where H+ is the hydronium ion concentration. Find the hydronium ion concentration of a particular lemon juice if the pH level is 2.1.

pH = – log(H+)

If 2.1 = – log(H+), then

    -2.1 = log(H+), and so

    10^(-2.1) = H+

We do that last step using the fact that log(x) and 10^x are inverse functions.

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

if you was gonna solve for a, a is a   < -12