There is a bag filled with 5 blue and 4 red marbles. a marble is taken at random from the bag, the colour is noted and then it is replaced. another marble is taken at random. what is the probability of getting 2 of the same colour?

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

In an improper fraction, is the numerator equal to, less than, or greater than the denominator