I have question about vectors, how would we display a vector where we go to the right 5 kilos, upwards 2 kilos, then to the left 10 kilometers, with an average speed of 20kmph, how would i say that as a vector (like left (this much) with a speed of (this much)

Then why is the question on here if you know the answer

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Difference means subtraction