Sid had a collection of baseball cards. he gave half to his brother. one third to a friend. half of what he had left to another friend. now he has 50 left. what did he start with?

If square root x = -7, then x= -49 true or false

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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?