A radioactive substance decays at a rate of 3.4% per day. If it starts at 200 grams, how many days will it take for the substance to decay to less than 150 grams?

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?