Find the slope of the following lines. please help!!

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

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?