What value must replace the "? " in order for this polynomial to be expressed as a difference of squares?
x^2+? x-36

What is the distance between (–2 1/2,-3) and (1, –3)?

Can you simplify 4/7? 24 points will be awarded!

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)