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 72?
[H] = log72
[H"] = -log72
[H] = 10-72
[H] = 1072

$35.59 in pounds

step-by-step explanation:

well if he bought them at 5 cedis each sold them at 7 cedis each then he would make a profit of 2 cedis of each book. if in total he made 150 cedis profit that means he sold 75 books. he lost 12 books at the start so that means he originally bought a total of 82 books.

step-by-step explanation:

the ratios are reciprocals im positive

step-by-step explanation:

they are all positive numbers so it wouldn't be the other ones