Ineed with these questions can someone me

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1