The temperature of a certain chemical substance varies sinusoidally with time. The highest temperature it reaches is 120° and the lowest temperature it reaches is 40° After 5 minutes, the high temperature was recorded and it takes 16 minutes to get back up to the
high temperature again. When will the temperature be 80° for the first time from t=0 minutes?
a 5 minutes
Ob. 1 minute
c. 13 minutes
d. 21 minutes

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