Meanings

square root

surfing

manning (e.g. vessel)

multiplicand

to jump on (a horse)

unauthorized travel

riding separately

hitchhiker

opportunist

taking advantage of (an opportunity)

sovereignty

to introduce oneself

giving one's name

to give one's name (as)

exponentiation

exponentiation

passenger

riding together

to place on (something)

the four arithmetical operations (addition, subtraction, multiplication, division)