The domain of f(x) is the set of all real values except 7, and the domain of g(x) is the set of all real values except -3. which of the following describes the domain of (gof)(x)? all real values except x-3 and the x for which f(x)+7 all real values except x-3 and the x for which f( all real values except x 7 and the x for which f(x) 7 all real values except x+7 and the x for which f(x)=-3

7

step-by-step explanation:

both equations and proportions are better.

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places