A mobile is shown in the figure. The horizontal supports have negligible mass. Assume that all the numbers given in the figure are accurate to two significant figures. What mass M is required to balance the mobile? 
Definitions:
Job Classification Method
A system used in human resource management for categorizing jobs into groups based on similarities in duties, responsibilities, and requirements.
Pay Grade
A step or level within an organization's salary structure that determines the amount of pay an employee receives.
Employee Competencies
The range of skills, knowledge, and attributes that are required for an employee to perform their job successfully.
Classification Systems
Methodologies or frameworks used to organize or categorize items, information, or concepts based on shared qualities or characteristics.
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