Solve the following equations over the interval [0, 21).
1+2cosx = 0
12-csc (a) = 0

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

What is the perimeter of a rectangle if the length is 5 and the width is x?

Find the solution to this system 2,1 1,-2 1,2 -1,2