360 miles traveled on 12 gallons of gasoline

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

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

My hour hand points between the 8 and the 9 in 35 minutes it will be the next hour. what time is it ?