How can you create equations in one variable

Aconstruction worker has rope 9 m long he needs to cut it in pieces that are each 3 /5 m long how many such pieces can he cut without having any rope leftover?

Which of the following is the graph of y= square root -x-3

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.