What is a reasonable number for the age of O'ahu? (Ma means millions of years)

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments

In science class richard learns that a substance has a boiling point of 230 fahrenheit his teacher ask him to convert this temperature to degrees celsius what is the boiling point of his substance in degrees celsius