Hey! how do i factorise theses three questions? ?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

What is the value of f(x) = 2.2 for f(-2)?