Suppose S is between R and T. Use the Segment Addition Postulate to solve for y. R
S
T
RS = 5y + 8
ST = 4y +4
RT = 84

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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

The room above is shaped like a rectangle and has a perimeter of 34 feet. if the room is 11 feet long, how wide is it?