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Name Date 6.6 Practice 3 1. Fifty grams of radium are stored in a container. The amount R (in grams) of radium present after t years can be modeled by R = 50e 0.000431 a. After how many years will only 20 grams of radium be present? b. Seventy-five grams of radium are stored in a different container. The amount R (in grams) of radium present after t years can be modeled by R = 75e-0.000431 . Will it take more years or fewer years for only 20 grams of the radium in this container to be present, compared to the answer in part (a)? Explain. In Exercises 2 & 3, solve the equation. Check for extraneous solutions. 2. 10g3 (-x) + 10g3 (x + 8) = 2 3. 10g2 (x + 2) + 10g2 (x + 5) = 4 In Exercises 4-9, solve the inequality. 4. 7* 2 7. ex-2 8. Inx > 5 9. -2 10g3 x + 2