Is posible to prove if the subway routes in a city were made using the graph theory? how?

No.

Step-by-step explanation:

Unless the design notes are archived, in our current reality, it is not possible to prove that a designer used any particular theory in the design of anything. Such a proof would involve after-the-fact mind-reading.

Even with design notes in hand, it is unlikely you could prove the designer was cognizant of any particular theory when writing the notes. All the time, people write things they don't understand, or that have meaning that is understood only after some time.

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.

y=1/4x-4

step-by-step explanation: