The magnitudes of each of the two displacement vectors r1 and r2 are equal to 29.0 m. determine the smallest angle between the two vectors in order for the magnitude of the sum of the two vectors (r1 + r2) to be 27 times greater than the magnitude of the difference of the two vectors (r1 − r2).

It is the areas with lines. this may sound a little confusing, but i hope it !

The answer to the question is (a)   

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.

Yup your right can give me more detail