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A birthday calculator is a tool that you can use to calculate many different way of looking at one's birthday. You can type in someone's birthday, and it will tell you how old they are in month, weeks, days, etc.
One week is seven days. Depending on which month you use, if one month is 30 days, then one week would be 7/30 of a month.
you use a scientific calculate
You can use a graph to calculate speed.
To calculate the area of a circle use this formula: pi x r2.