ASAP HELP What is the pH of a solution with a hydronium ion concentration of 5.6 × 10-7? (pH = -log[H3O+])

A.
5.6

B.
6.25

C.
7.00

D.
14.40

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field