If a = 7 and b = 11, what is the measure of ∠B? (round to the nearest tenth of a degree) A)32.5° B)39.2° C)50.5° D)57.5°

What expression is equivalent to log3(x+4)

If i have 20$ and i gave 5$ away how much i got

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?