# I have a pre-calculus word problem that I need help with.

Dec 8th, 2015
KateS
Category:
Calculus
Price: \$5 USD

Question description

Let D be the set of all calendar dates from 4/30/1789 to 9/25/2014.

Let P be the set of names of U.S. presidents.

Let F be the set of names of first ladies of the U.S.

Consider the following two functions press : D ⇒ P where  pres(d)  is the name of the president of the U.S. on date  d  (the incumbent on inauguration days, to avoid ambiguity) and   lady : P ⇒ F   where   lady(p)   is the name of the first lady of the U.S. during the presidency of president   P.

2. Which of the following functional inverses exist and which do not?    pres-1, lady-1, (lady°pres)-1, (pres°lady)-1   (the -1 should be in superscript)

Thank you.

(Top Tutor) Daniel C.
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School: UCLA

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Sigchi4life
Dec 8th, 2015
"excellent work as always thanks for the help"

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