Answer: 11
Step-by-step explanation: You divide 495/45 and you get 11
we have M is durectly porpotional to r^2
so M=(k)r^2
and when r=2, m=14
so 14=(k)(2)^2
k=14/4 =7/2
so when r=12
m= (7/2)(12)^2 =(7/2)(144) = 504
1 because you replace x with 2 so, (2)squared -5x2 + 7 = 4 - 10 + 7 = 1