What is 820.681 in expanded form, using powers of 10?

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

Find two rational expressions that have the difference of 2-n/n-4

Empty box + box + empty box fill in the box is equal to 30 how