Complete the following expressions below to make the statement true. 1. 81x² - 36 = (9x+36) (-)
2. x²- 9 = (2x+3)(2x-3)
3. x² + - 15 = (4x+3)(2x-5)
4. x²+6x+9= (+)

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Zahra was given two data sets, one without an outlier and one with an outlier. data without an outlier: 15, 19, 22, 26, 29 data with an outlier: 15, 19, 22, 26, 29, 81

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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.