In a contest, each finalist must answer 4 questions correctly. each question is worth twice as much as the question before it. the fourth question is worth 2,000. how much is the first question worth? show work.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

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?

Tan198=asin164=? how to solve this? ?