Started: Apr 28 at 9am
Quiz Instructions
Question 2
20 pts
A veterinary office offers customers a rebate for purchasing heart-worm
medication for their dogs. The cost of the heart-worm medication is $120
for 6 pills and there is a $10 mail in rebate. On Tuesdays, the medication is
an additional 15% off. How much will customers pay on Tuesdays?

24+x=y

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