The numbers a, b,c and d are distinct positive integers chosen from 1 to 10 inclusive. What is the least possible value a/b + c/d could have ?

Hassan bought a package of tofu. the temperature of the tofu was 14° celsius when hassan put the package into the freezer. he left the tofu in the freezer until it reached –19° celsius. which expressions explain how to find the change in temperature, in degrees celsius, of the package of tofu? select three that apply.