If Ф ∈ (0, pi/2) and tan(pi cosФ) = cot(pi sinФ), then cos(Ф- pi/4) is equal to?\

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip