What is the value of t?
Points D and E are midpoints of the sides of triangle ABC
The perimeter of the triangle is 48 units.
2
B
3
6
D
8
31
E
А"
4t
7t + 6

Iam so stuck. what is the worked out answer for this question?

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)

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great