Select all that have negative values (merry christmas)

cot(pi)
csc(5pi/4)
sec(-65°)
csc(340°)
sec(120°)

Plz ! what is the volume of this pyramid? with numbers of 30cm 14cm 18cm

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?