A circular sinkhole has a circumference of 75.36 meters. A week later, it has a circumference of 150.42 meters.
a. Estimate the diameter of the sinkhole each week.
At first, the sinkhole has an approximate diameter of
meters. A week later, the diameter is about ____
meters.
b. How many times greater is the diameter of the sinkhole a week later?
The diameter of the sinkhole now is about ___
times greater compared to a week later.