Sarah bought a 7-year old car for $10,500. When the car was new, it sold for $21,000. Therefore, the depreciation rate is 9.4%.
Answer the following statement true (T) or false (F)
True
» 0.94 or 9.4%
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Solve the problem.A certain radioactive isotope decays at a rate of 2% per 200 years. If t represents time in years and y represents the amount of the isotope left, use the condition that 
to find the value of k in the equation 
A. -0.02020 B. 0.00010 C. 0.01332 D. -0.00010
Determine whether the graph represents a function.
A. Yes B. No
Determine the constant term that must be added to the expression to make it a perfect square.x2 - 18x
A. 324 B. 9 C. -81 D. 81
Solve the problem.The distance d in miles that can be seen on the surface of the ocean is given by 
where h is the height in feet above the surface. How high (to the nearest foot) would a platform have to be to see a distance of 20.5 miles?
A. 420 ft B. 546 ft C. 158 ft D. 249 ft