The United States Postal Office delivers about 2^4 • 3 • 5^3 pieces of mail each second. There are 2^8• 3^4 • 5^2 seconds in 6 days. How many pieces of mail does the United States Postal Office Service in six days write your answer as an expression involving three powers.

The United States Postal Service delivers ___ pieces of mail in 6 days.

By definition, the standard equation of the circle is given by:
 
 Where,
 (xo, yo): coordinates of the center of the circle
 r: radius of the circle
 To find the radius of the circle, we use the formula of distance between points.
 We have then:
 
 Substituting values:
 
 
 
 
 
 
 Then, the center of the circle is:
 
 Substituting values in the general equation we have:
 
 Rewriting:
 
 
 The standard equation of the circle is: