If 5 is transformed into 11 and 12 is transformed into 25, then what does 15 become

Need solving this second acceleration problem.

What is negative 3/9 times negative 2/8 ?

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2