7. A Honda Accord depreciates at 15% per year. Six year ago it was
purchased for $21,000. What is it worth now?

7920.14

Step-by-step explanation:

The formula is y = a (1-r)^t

21000 (0.85)^6

0.85^6 = 0.37714951562

21000 (0.37714951562) = 7920.14

what is the approximate angle of acb if abc is 25cm and the length of segment bc is 15

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