Which of the following could be considered a scientific statement?
pizza is the best food on earth.

ghosts are all around us.

ants live in colonies.

brown is an ugly color.

-- pizza -- "best" can't be measured

-- brown -- "ugly" can't be measured

So neither of these can be studied, and neither of the statements could be the result of a previous scientific study.

-- ghosts -- there has never been a single verifiable observation to support this statement.

So "ants" is the only statement left. It's supported by hundreds of years of observations, and can be observed by anyone who's interested

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west