The cost to mail a letter is a base charge of $0.42 plus $0.17 for each ounce. write an expression to represent the cost for mailing a letter that is w ounces. then find the cost for mailing a letter that is four ounces.

You have to include .42 because that is the base amount to charge.  Then because you need to charge .17 for each extra ounce and multiply that by W, that would be .42+.17(W).  Then substitute 4 for W.



I think you should be able to find out the answer from there!  I hope it helps :))

Is there a picture because i cannot answer it sorry