What would the equation of the line be that passes through the points (0,-2) and (3,0)? What would the equation of the line be that passes through the points (0,-3) and (-3,3)?

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

Extra points! find the missing dimension! need asap

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4