One cleaning crew can clean a school in 6 hours. A second crew can clean the school in 9 hours. How long will it take if both crews work together to clean the school?

What is the y intercept of f(x)=(1/2)^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

Which graph represents the given linear function 4x+2y=3