Which is the graph of y=[x]-2? HELP IM TIMED

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.