Un conjunto de datos cuantitativos numérico puede tener más de una media ?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )