For #7, in exponential form, you raise your base, x, to the solution, z, and set it equal to y. In other words, [tex] x^{z}=y [/tex]. If you have to use your calculator, unless you have a TI 84+, I'm not sure if the function is there. In a TI 84+, you go to MATH and scroll down to logBASE( and change it like that. If you don't have this on your calculator, then use the formula to put things into bases of 10: [tex] \frac{log(6.8)}{log(7)} [/tex] to get .9851 Both come out exactly the same. Lastly, to find the inverse of a function, switch the x and the y and solve for the new y. Switching the x and y in your function in #9, you have [tex]x=log _{2} y[/tex] and rewriting that using the fact that log functions and exponential functions are inverses of each other, [tex] 2^{x}=y [/tex]
