Can you help me with this question. I have to put it into scientific notation

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

Amovie streaming service charges it’s customers $15 a month. martina has $98 saved up. will she have any money left over if she pays for the maximum amount of months she can afford? explain.