Arectangle has a width of 9 units and a length of 40 units. what is the length of a diagonal?

One positive number is 9 more than twice another. if their product is 95, find the numbers

Is the figure congruent? yes or no?

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?