One ratio you could use for converting units is

1 kilograr

1,000 grarns

o

a. true

ob. false

true

Step-by-step explanation:

The international system of measures established for units that have to do with weight the standard measure would be in grams, to express larger units to avoid very long numbers it was established that one kilogram equals 1000g, so the ratio between them is 1000 .

to convert from grams to kilograms we divide by 1000.

to convert kilograms to grams multiply by 1000

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons