What does the constant term in the above expression represents?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

Find cot x if sin x cot x csc x = √2