PLEASE HELP Decide whether or not the equation has a circle as its graph. If it does, give the center
and the radius. If it does not, describe the graph.
x2 + y2 + 6x + 4y + 9 = 0
Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice.
A. The graph of the equation is a point.
B. The graph of the equation is a line.
C. The graph of the equation is a circle with center
The radius of the circle is
D. The graph is nonexistent.
(Type an ordered pair.)

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Name and describe the three most important measures of central tendency. choose the correct answer below. a. the mean, sample size, and mode are the most important measures of central tendency. the mean of a data set is the sum of the observations divided by the middle value in its ordered list. the sample size of a data set is the number of observations. the mode of a data set is its highest value in its ordered list. b. the sample size, median, and mode are the most important measures of central tendency. the sample size of a data set is the difference between the highest value and lowest value in its ordered list. the median of a data set is its most frequently occurring value. the mode of a data set is sum of the observations divided by the number of observations. c. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is the product of the observations divided by the number of observations. the median of a data set is the lowest value in its ordered list. the mode of a data set is its least frequently occurring value. d. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is its arithmetic average. the median of a data set is the middle value in its ordered list. the mode of a data set is its most frequently occurring value.