Is this right? I NEED AN ANSWER NOW

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?