Factor the following polynomial completely.

-x^2 y^2 + x^4 + 4y^2 - 4x^2

a) (x - 2)(x - 2)(x + y)(x - y)
b) (x + 2)(x + 2)(x + y)(x - y)
c) (x + 2)(x - 2)(x + y)(x - y

Atrucker had a load of grain containing 2 tons. she unloaded 1 ton and 1,200 pounds at the warehouse. how much grain does she still have left on the truck?

How to solve a simultaneous equation involved with fractions?

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online