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Could answer every question with steps

What is the effect on the graph of the parent function f(x) = x when f(x) is replaced with 3f(x)? a) shifts the line 3 units up b) shifts the line 3 units down c) increases the slope of the line by a factor of 3 d) decreases the slope of the line by a factor of 3

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your