If a/b=1 and a+b=17.3146, find the value of a-b in simplest form

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

One integer is 8 times another. if the product is 72, then find the integers

Factor and solve to find roots x squared -x - 90 =0