I’m not sure of what the answer is. Can u help me, please and thank you.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)

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