(x+2)(x-2)+(x+5)^2=x^2

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.