Think about the relationship which equation models the cost c(m) of renting m movies

We could make up a Real-Life problem.

Step-by-step explanation:

Randy goes to buy movies. The seller gives him a deal and tells him for every 5 movies he buys he has to pay 20$, If he pays for 20 movies how much would he pay for? Extra tip: there is 10% off discount for every 10 movies he buys.

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

60: 45 =12: 9 =4: 3 so the answer is 4: 3