Khan academy literally rejected my correct answer in all fraction form and i changed only the y-intercept to the decimal equivalent and got it correct as if i haven't been taught my whole life to either have all decimals or all fractions in one answer so i'm done with khan academy at this point you solve the equation so i can go to bed?

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 areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

Free points also plz look my profile and answer really stuff