Can someone help me, please

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?