Lia estimées that the lenth of her bedroom is 20 m Is this a reasonable estimate? Give a reason for your answer

Based on what i know about mean, this doesn't add up.

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

What’s -11-33k and factor each expression completely