A county park charges $12 per hour to rent a row boat, plus a $20 deposit. The total cost y to rent a boat for x hours can be represented by the function y = 12x + 20. Which set of numbers represents sensible input values for this situation?
A. integers
B. decimals
C. whole numbers
D. irrational numbers

The line containing the midpoints of the legs of right triangle abc where a(-5,5), b(1, 1), and c(3, 4) are the vertices.

Ineed to know the answer to this algebra question.

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)