A raffle is held. There are 100 tickets, each selling for $10. Sole prize is a $400 laptop computer. What is the expected value? (don't type in $ sign)

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

Which expression gives the area of the triangle shown below

Which of the following is equal to the rational expression when x is not equal to -2 or -6?