Có bảng biến thiên như sau:

Hàm số đồng biến trên khoảng nào dưới đây?

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)

This is about circle theorems. someone asap : (

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school