Plsss help ASAP I DONT have time..

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1