Ms. Green’s car has a 15-gallon gas tank. If f represents the fraction of a tank of gasoline left in Ms. Green’s car, which expression represents the number of gallons Ms. Green would need to pump in order to fill the tank?

C. precise

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.