I know how many line of symmetry but i dont know how to explain so can someone explain it for me?

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

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

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42