If 0.3 = 1 then 0.9 = 3 because 0.3+0.3+0.3=the 3.
C as when they put more hours into the social media they will study less and less which leads to less test scores
Oh ok. So I think that x is 83. Because I did this 630-100-121-106-112-108=83. And then I did 630/6 and got 105 and thats the mean.
39-(15z+48)/27=35
39-35=(15z+48)/27
4=(15z+48)/27
108=15z+48
108-48=15z
60=15z
z=60/15
z=4
