How do i simplify and/or rewrite secxcotx-sinx?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

Ms. ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms. ortiz charge per kilogram of tomatoes to make on a load of tomatoes?

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2