The equation below describes a parabola. if a is positive, which way does the parabola open? x = ay2

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For what value of (y) is 3^3/3^y =1/9

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?