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What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

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

Yvaries inversely as x. y =12 when x=5. find y when x=4