In a trapezoid, the diagonals have lengths 10 and 24, and are perpendicular to each other. Find the length of the median. Note: The median is the line segment joining the midpoints of the legs.

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

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.