What is the decimal of 45/100

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true