Simplify expression 7w+2w-6w,
9x-3x+2x, 8p+3p-p

Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days

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)

Are the corresponding angles congruent? explain why or why not.