Simplify (7x) - (-2x).
A.-9x
B.-5x
C.9x
D.5x

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)

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

Given abc find the values of x and y. in your final answer, include all of your calculations.