Us national forest cover approximately 300,000 square miles. conversationalist want the total square footage of forests to be 300,000 (2nd power) square miles away. when i vanna used her phone to do the calculation, her screen showed 9e+10. a what does the answer on her screen mean? explain how you know b. given that the us has approximately 4 million square miles of land, is this a reasonable goal for conversationalist? explain