You randomly select 2 marbles from a mug containing 5 blue marbles, 4 red marbles, and 3 white marbles. How many times greater is the probability of selecting 2 blue marbles when you replace the first marble before selecting the second marble than when you do not replace the first marble before selecting the second marble? Express your answer as a fraction.

Is a positive integer raised to a negative power always positive

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

It says factor each expression 49x-28?