Question: First-class postage for a standard letter is 49 cents for the first ounce or part of an ounce that a letter weighs plus an additional

First-class postage for a standard letter is 49 cents for the first ounce or part of an ounce that a letter weighs plus an additional 21 cents for each additional ounce or part of an ounce. Use the table or graph of the postage function, f (x), to determine the following.

(b) f(2.5)
(c) Is f(x) continuous at 2.5?

(e) f(4)
(f) Is f(x) continuous at 4?
Weight xPostage f (x)
0 1 2 3 4

lim f(x) x2.5 lim f(x)

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