Answer to Question 1
B
Answer to Question 2
Routine requests are granted almost automatically, whereas favors require persuasion. When you don't know the person to whom you're writing, you should begin the request with an attention-getter and stress the reader benefits from granting the favor. At least one reader benefit should be discussed before making the request. Keep a positive, confident tone throughout the message, making the action clear and easy to take. Above all, keep the request reasonable, and don't ask someone else to do something that you can or should do yourself.
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The Flaw in Eyewitness Testimony
If we make the substitution z=sqrt(x) to ∫sqrt(1-sqrt(x)) dx, the resulting integral is