Naomi surveyed some students to determine their favorite subject. The experimental probability of a student choosing math as their favorite subject is . If 16 of the students chose math as their favorite subject, what is most likely the number of students surveyed? A. 112
B. 28
C. 21
D. 64

Iam so stuck. what is the worked out answer for this question?

Given f(x)=2x^2-8x+6 and g(x)=3x-1 find f(x) +g(x) a. 2x^2+5x+5 b.2x^2-11x+7 c. 2x^2-5x+5 d.2x^2-5x-5

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?