Which of the following statements shows the inverse property of addition? 1. a+a=2a
2.a+0=a
3.a+(-a)=0
4. 1a=a

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.

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8