Simplest form w^3-w(w^2+2w-1)+2w

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Rai compares two cable plans from different companies. which equation gives the correct value of mm, the number of months for which plans a and b cost the same?

Which two fractions are equivalent to 24/84? 6/42 and 2/7 6/21 and 2/6 12/42 and 3/7 12/42 and 2/7