Adding and subtracting matrix
Plz help me

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.

How do you solving the solution of each system using elimination?

Which expression is rational? 6. , square root two, square root 14, square root 49