Which best describes the purpose of a control sample? O to have more quantitative data to analyze at the end of the experiment
O to have more qualitative data to analyze at the end of the experiment
O to compare its results to those of a well-known scientist
O to compare its results to those with the experimental sample

not moving. pos accel,

radiation

explanation:

heat is transmitted by radiation

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

i think it would be 5