Figure abcd is a square. Find the measure of < ABE

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

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?