Which expression is equivalent to 2a+1/10a-5 / 10a/4a^2-1

What is the pattern in the values as the exponents increase?

Determine which postulate or theorem can be used to prove that lmn =nmo

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.