Which expression has a value of 6 when x=2 and y=4?

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?

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

My hour hand points between the 8 and the 9 in 35 minutes it will be the next hour. what time is it ?