The supplement of an angle is nines times as large as the complement of the angle. What is the measure of the angle to the nearest hundredth of a degree?

A)
11.25°

B)
39.75°

C)
72.50°

D)
78.75°

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Ineed i been stuck on this question since yesterday

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?