The year in which the US Civil War ended was 25 percent later than the year Christopher Columbus set sail from Spain. If c represents the year Columbus set sail, we can write the year the Civil War ended as c + 0.25c. Rewrite this expression as a single term. Rewrite the expression c + 0.25c using fractions instead of decimal numbers.

Rewrite the expression you developed in Part B as a single term with a fractional coefficient.

Are the expressions you developed in Part A and Part C the same? Why or why not?

Christopher Columbus set sail from Spain in 1492. In what year did the Civil War end?

The year the Greek city of Helike disappeared is times the year the US Civil War ended. Let w represent the year the Civil War ended. Write an expression in terms of w to represent the year of Helike’s disappearance.

Use the results from Part E and Part F to determine the year Helike disappeared. Express your answer in terms of BC or AD.

Using the results from parts D through G, write an expression that represents the number of years elapsed between the disappearance of the Greek city of Helike and the end of the US Civil War. Write the expression in terms of c and w. Then solve the expression to find out how many years separate these two events.