I am a number between 60 and 100 my digit is two more than my tens digit I am a prime number what number am I

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

What is the range for 31,39,29,34,37,24,36,33,34,28

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)