Hey guys my teacher said she would give us extra credit if she knew what ‘’kiss’’ meant in mathematics can you tell me what does kiss mean i. mathematics?

What is the product? a-3/15a × 5/a-3

Milk and ice cream are mixed together for a recipe. the total volume of the mixture is 1 cup. if the milk contains 2% fat, the cream contains 18% fat ,and the mixture contains 6% fat ,how much cream is in the mixture

If the average of x,y and z is 15 what is their sum