A new car is purchased for \$20,000$20,000 and over time its value depreciates by one half every 6.5 years. How long, to the nearest tenth of a year, would it take for the value of the car to be \$9,000$9,000?

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)