Advd store charges $4.70 for each day d a dvd is rented.
the store also gives you a dollar off if the dvd is returned before 5 days.
a. write a rule to represent the rental charges c.
b. how much will you pay if you return the dvd after 4 days? 7 days?

4.70c and 18.8 4 days and 32.9 7 days

step-by-step explanation:

plz brainliest hope i could

300pi

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