How far apart are the foci of an ellipse with a major axis of 20 feet and a minor axis of 14 feet?

How do i do this activity, is appreciated

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

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?