What is 31 billion in scientific notation?

which  best  describes the transformation from the graph of  f(x) =  x2  to the graph of  f(x) = (x  – 3)2  – 1?   left 3 units, down 1 unitleft 3 units, up 1 unitright 3 units, down 1 unit  right 3 units, up 1 unit

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

The suare root of 9x plus 7 plus the square rot of 2x equall to 7