At the moment a hot cake is put in a cooler, the difference between the cake's and the cooler's temperatures is 50 degree celsius. this causes the cake to cool and temperature difference loses 1/5 of its value every minute. write a function that gives the temperature difference in degrees celsius, d(t) minutes after the cake was put in the cooler.

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?