To win the small county lottery, one must correctly select 3 numbers from 30 numbers. the order in which the selection is made does not matter. how many different selections are possible?

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

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

Explain in a minimum of 2 sentences how to graph the equation of the absolute value function given a vertex of (-1,3) and a value of “a” equal to ½.