PLEASE HELP PLEASE HELP 19 POINTS...PLEASE HELP

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

If square root x = -7, then x= -49 true or false

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.