Evaluate 3+(-2) help pls I don’t know it’s for math

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

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?

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4