Select true or false for each statement.
for a real number a, a + 0 = a
for a real number a, a + (-a) = 1
for a real numbers a and b, | a - b | = | b - a |
for real numbers a, b, and c, a + (b ∙ c) = (a + b)(a + c).
for rational numbers a and b when b ≠ 0, is always a rational number.

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.

Ineed in figuring out this problem.

Aconstruction worker has rope 9 m long he needs to cut it in pieces that are each 3 /5 m long how many such pieces can he cut without having any rope leftover?