Solve the equation 11(5c-1)-18=53c+11
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What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

In the diagram of circle o, what is the measure of zabc?