Which expressions are equivalent? Check all that apply.
3^9 3^4 -9^2 9^9 81^1

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Find the domain and range of the following function f(x) = 51x - 21+ 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.