Find the equation of the circle whose center and radius are given. center ( 7, -3), radius = sqrt. 7

True or false? many triangular shapes can be circumscribed about a given circle

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Ineed to know the answer to this algebra question.