How many chapter titles are in the tabular for Volume 1 of the ICD-9-CM coding book?

What category would include a patient with a blood pressure of 134/84 mmHg?

A) Normotension B) Hypertension C) Prehypertension D) Hypotension

Which of the following correctly expresses Ohm's law?

a. R = I ? V c. I = V ? R b. V = I ??R d. V = I/R