Which of the statement best difines what emergent mathematics

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

On a piece of paper graph f(x)=5•(0.4)^x

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)