Ineed with this arithmetic sequence show work if possible

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?

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.