Which expression gives the length of QR in the triangle shown below?

Measure of angles 31 (x+4) (3x+9) me

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers