If a coin is flipped twenty-five times and lands tails up seventeen times, the experimental probability that the coin lands tails up is .

Select the sequences that are geometric.

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?

Which ordered pair is a solution of the equation? 2x+3y=10