How many complex roots does the equation 0=3x^5-x^4-5x^2+1 have​

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.

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

I’m really confused and need to learn this