A plumber charges $55 for a service call plus $35 per hour. If the plumber's bill was $160, how many hours was he there? (Write only the numeric answer)

Which property is illustrated by the following statement? if hxa rgi, then rgi hxa.

If you answer right ill give brainliest, : )

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?