john went on a bike ride to the store 4 miles away. if it took john 3/10 of an hour to get there and 1/2 of an hour to get back, what was his average rate of speed (miles per hour ) for the entire trip?

The parabola opens: y=√x-4 (principal square root) up down right left

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

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