Some help here?

Which of the following IS a polynomial?

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

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)