The math club purchased 150 calendars for $2.00 each. if the club sells the calendars for $5.00 each, what will be the total profit if all the calendars are sold?

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

How can you tell when x and y are not directly proportional?

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?