Interior angles of a square always sum to 360°. A reflection in the x-axis would not change this.
Multiplying a fraction by a repeating decimal since a fraction is rational and a repeating decimal is rational (repeating numbers will always be rational). Rational number time rational number=rational Pi is an irrational number since the numbers are not repeating (3.1415926535 no repeating numbers as opposed to 0.3333333333333333333 or 0.1919191919)
D the sample mean would less closely model the population mean
X / 6=3.5 would be the answer
What exactly do you want to know? make it clear??