Each side of the rhombus is 121 feet
For this case we have that by definition, the equation of the line in the slope-intersection form is given by:

Where:
m: It is the slope of the line
b: It is the cut-off point with the y axis
We have the following points through which the line passes:

We find the slope of the line:

Thus, the equation of the line is of the form:

We substitute one of the points and find b:

Finally, the equation is:

Answer:

70 x 100 = 7,000
Therefore, 70 hundred is equal to 7 thousands.
You slowly go down the bottom row and multiply each digit by the top row.