Question: please answer everything 7. 2x - 16x2- 40x = 0 8. x4 - 16x2 = x2 + 18 9. 4x4 + 35x2 - 9=0 10.

please answer everything

7. 2x - 16x2- 40x = 0 8. x4 - 16x2 = x2 + 18 9. 4x4 + 35x2 - 9=0 10. x3 +3x2 =24x +72 12. The population of a species is modeled by 11. 2x - 5x2 + 40x - 100 = 0 the equation p(t) = -+ + 7212 + 225 where i is the number of years. Find the approximate number of years until the species is extinct

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