Amir and Mai collect a total of 1913 key rings. Mai gives away 123 key rings . Amir then has 4 times as many key rings as Mai. How many key rings does Mai have at first

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

How many 2/5s are in 1 and 1/2 plz someone me right now