Please could you answer this , im not very good at math's and I know allot of people on this are

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

See attachment below and find the equivalent of tan(∠qsr)