The graph below represents the future value of a CD, after x years have passed. What was the opening balance of the CD?
Future Value
45000
40000
35000
30000
25000
20000
15000
10000
5000
od Years
10
O
10
20
20
30
-5000
A. $5000
B. $500
C. $6500
D. $3500

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)