Answer: 504
Explanation:
m is directly proportional to r squared.
m = k(r)^2 (1)
where m = 14
r = 2
k = constant of proportionality.
substituting the values into equation 1
14 = k (2)^2
14 = k4
divide both sides by 4
14/4 = k4/4
k = 3.5
to find m, when r = 12
from equation (1)
m = k(r)^2
m = 3.5 (12)^2
m = 3.5 (144)
m = 504.