PROVIDENCE, R.I. (AP) — Gas prices remain on the rise in Rhode Island, but there are signs that the large weekly increases of the last few weeks may be slowing down.AAA Northeast reports Monday that self-serve, regular is selling for an average of $2.86 per gallon, 3 cents higher than a week ago.The current price is 3 cents per gallon lower than the national average, and a penny higher than the year-ago price in Rhode Island.AAA found gas selling for as low as $2.