College Algebra, 4th Edition

Building Skills

1. 9. $\text{pH }=8,$ base

2. 11. $\text{pH }\approx 4.64,$ acid

3. 13. $[{\text{H}}^{+}]={10}^{-6},[{\text{OH}}^{-}]={10}^{-8}$

4. 15. $[{\text{H}}^{+}]=3.16\cdot {10}^{-10}[{\text{OH}}^{-}]=3.16\cdot {10}^{-5}$

5. 17.

   1. ${10}^5{I}_0$

   2. $7.94\cdot {10}^{11}$

6. 19.

   1. $6.3\cdot {10}^7{I}_0$

   2. $1.26\cdot {10}^{16}$

7. 21.

   1. 6;

   2. ${10}^6{I}_0$

8. 23.

   1. 5.1

   2. $1.26\cdot {10}^5{I}_0$

9. 25. 40

10. 27. 55.4

11. 29. ${10}^{-4}$

12. 31. $2.95\cdot {10}^{-6}$

13. 33. A#466 Hz, C523 Hz

14. 35. $\approx 18$ cents; noticeable

15. 37. A is $\approx 2.5\times {10}^6$ times brighter than B.

16. 39. B is $\approx 6.31$ times brighter than A.