An American traveler who is heading to Europe is exchanging some U. S. dollars for European euros. At the time of his travel, 1 dollar can be exchanged for 0.91 euros. Find the amount of money in euros that the American traveler would get if he exchanged 100 dollars.
euros

What if he exchanged 500 dollars?
euros

Write an equation that gives the amount of money in euros, e, as a function of the dollar amount being exchanged, d.
e = d

Upon returning to America, the traveler has 42 euros to exchange back into U. S. dollars. How many dollars would he get if the exchange rate is still the same?
dollars
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Part B
Write an equation that gives the amount of money in dollars, d, as a function of the euro amount being exchanged, e