a rectangle has a width of w+2 and length 3w+1 write and simplify an expression for the perimeter of the rectangle

How do you use the elimination method for this question? explain, because i really want to understand!

How can writing phrases as algebraic expressions you solve problems?

At the beginning of a call to the cable company, a message tells customers, "after you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you recieved. it would be appreciated if you could stay on the line to answer the survey questions." what type of sampling is the cable company using?