Which of the following in an example of an informal salutation?
a. dear sir:
b. hi suzanne,
c. dear professor amato:
d. to whom it may concern:

b. hi suzanne

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. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.