Question

what is the first step when solving dimensional analysis problems? t your \known\ in top front identify your \known\ and \unknown\ cross out units that are opposite each other write your plan

Explanation:

In dimensional analysis, the first step is to identify what quantity is known (given) and what quantity is unknown (to be found). This helps in setting up the conversion factors and the structure of the problem. The other options like putting known in front, crossing out units, or writing the plan come after identifying known and unknown.

Answer:

B. Identify your "known" and "unknown"