Show that the determinant |(x+y, x , x) ( x, x+y, x) ( x ,x , x+y)| =(3x + y)y power 2

Marie drew the triangle shown. she wants to draw a second triangle that is different from this one. use the drop-down menus below to complete the statements about the second triangle.

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?  

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?