Two trains leave the station at the same time, one heading west and the other east. the westbound train travels at 90 miles per hour. the eastbound train travels at 80 miles per hour. how long will it take for the two trains to be 272 miles apart? do not do any rounding.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?