(4x + 9y) - (10x - 3y + 6) simply the expression

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two

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