Plis help a particle is moving along the x axis for t>0 the position of the particle is given by x(t)=t^3-9t^2-21t+6. at what time, t, does the particle change directions.

The parking lot of a store has the shape shown. all angles are right angles. what is the area of the parking lot?

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)