What is the value of f(x)=3x-12forx=9?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

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)