exam Maths Puzzle Numerical Ability

Find the dot product v dot w if v = i + j and w = -i + j.

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This question really has me stumped. Can anyone help me?
Thank you very much

Tell which real number corresponds to the situation.
During a month a person withdraws 235 dollar i had to write in the simplest form without negative exponents my problem was (y^-1)^-2 and i got y^2 is that right??