It took Brian 6 hours to drive to a job interview. On the way home, he was able to increase his average speed by 19 mph and make the return drive in only 4 hours. Find his average speed on the return drive.
Step 1 of 3: Complete the following table by entering the missing values, using x to represent the unknown quantity.

ab: 2 n83b8eb7ebi. 8e yen in

exactly you go it

step-by-step explanation:

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