Hi Redsox. I live in NY, but born in RI. My grandma lives in Cranston, sister and mom in Pawtucket. I would start with a minimum, say $25 or so for mow, trim and blow. Remember that the houses with all the fences and landscaping take more time, even if they are small. If you plow with a 1500 Dodge you will void the warranty. Trust me, I learned the hard way. That is why I own a 2500HD GMC now.
I agree with the others to check and see what others are getting in your area also. Just remember they may have been in business for awhile and are quicker and have more efficient equipment than say a guy just starting out, so they probably charge accordingly. Good luck to you. Don't forget about insurance.