Write this as an expression: Sarah has a rain gauge in her backyard. She started on Monday with 1/4 inch of water in her gauge. On Tuesday, it rained and additional 2 1/2 inches. On Wednesday, the sun was very hot and she noticed that 1/4 inch of water had of that water had evaporated. On Thursday, there wasn't any rain and none of the water of operated. On Friday, it rained 1/2 inches.