Question

The elevation of city A is 60ft above sea level; the elevation of city C is 12ft above sea level. the elevation of city D is 1/2 of the elevation of city Cwrite an expression to represent the elevation in ft of city Dsolve the expression and explain why the answer is negative or positive.

Answer 1

PARAMETERS PROVIDED:

The elevations of the cities are given, all above sea level:

$\begin{gathered} A=60ft \\ C=12ft \\ D=\frac{1}{2}\text{ of C} \end{gathered}$

CALCULATIONS:

Since the elevation of City D is half of that of City C, we can calculate this as shown below:

$D=\frac{1}{2}\times12=6ft$

CONCLUSION:

Part 1: The expression is shown below:

$D=\frac{1}{2}\times C$

Part 2: The elevation of City D is 6 ft.

Part 3: The answer is positive. This is because City D is still above sea level since that of City C is as well. All elevations above sea level are positive.