What is the vertex of the graph of y= -x^2?

In pqr the obtuse angle is 105 and the shorter sides measure 4 and 7 units rounded to the nearest tenth what is the area of triangle pqr

2(n-1)+4n=2(3n-1)n=0no solutioninfinitely many solutions n= - 4 !

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of