Iwill mark brainlestread the excerpt from "tools of the spymaster." the idea of invisible ink had been around for a long time. write using lemon juice as ink, for instance, and the writing will be invisible. heat the paper, and the writing will appear, looking as if it were written in brown ink. british agents used two types of ink. one could be made visible by holding the paper over the flame of a candle; the other could be read by applying a common chemical. major john andre, the chief british intelligence officer in new york, told his agents to put an f in the corner of letters containing invisible ink needing fire to read and a for those needing acid. the author’s main purpose in this excerpt is to a. explain the use of invisible ink during the american revolution. b. expose unsuccessful spying tactics used by the british during the american revolution. c. teach readers how to create secret documents using common chemicals. d. tell an interesting story about the british intelligence officer major john andre.

The right answer is the A) Explain the use of invisible ink during the American Revolution.  

Explanation: Just to elaborate a little on the answer, it can be added that options C and D should be discarded as invalid, since the excerpt is not meant to teach contemporary readers how to create secret documents using common chemicals and, although it does mention Major Andre and it tells an interesting story about what he did as intelligence officer during the American Revolutionary War, it also provides a brief historical account of the use of invisible ink. In addition, option B is also wrong, since the spying tactics that are mentioned in the excerpt were indeed successful. The excerpt reflects upon the use of invisible ink by British agents, such as Major Andre, during the American Revolution, and the strategies that they employed in order to identify the various types of inks.  

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

antonyms of what word?

explanation: