What is the scale factor of a model car if the scales is 1 inch=2feet

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)

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Which of the following can be used to explain a statement in a geometric proof?