Chapter 9.C, Problem 15E

Review of logarithms. Use the skills coveted in the Brief Review on p. 542 to solve the following equations for the unknown quantity x. 11. \[{2^x} = 128\] 12. \[{10^x} = 23\] 13. \[{3^x} = 99\] 14. \[{5^{2x}} = 240\] 15. \[{7^{3x}} = 623\] 16. \[3 \times {4^x} = 180\] 17. \[{9^x} = 1748\] 18. \[{3^{x/4}} = 444\] 19. \[{\log _{10}}^x = 4\] 20. \[{\log _{10}}x = - 3\] 21. \[{\log _{10}}^x = 3.5\] 22. \[{\log _{10}}x = - 2.2\] 23. \[3{\log _{10}}x = 4.2\] 24. \[{\log _{10}}(3x) = 5.1\] 25. \[{\log _{10}}(4 + x) = 1.1\] 26. \[4{\log _{10}}(4x) = 4\]