If a mixture of red and green light hits the human eye, it will create the visual impression of "yellow .e, not a mixture of red and green) hits the the same happens if light of the spectral color yellow (i eye. why can't the eye tell these obviously different situations apart?

there are no correct statementd on the list of choices you provided.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach