Help

How to get from here to here

Ineed ! i have no clue how to do this problem.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of