Find the diameter of the circle with the given circumference. use 3.14 for pi

C=23 cm

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

The anwser cause i do not understand just plez

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?