Two trains we stations for 16 miles apart at the same time and travel toward each other. One train travels at 85 mph while the other travels at 75 mph how long will it take for the two trains to me do not do any rounding

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.