Answer: D
Step-by-step explanation:
varies directly means [tex]\frac{f(x)}{x} = k[/tex]
Solve for k: [tex]\frac{f(x)}{x} = k[/tex]
[tex]\frac{24}{2} = k[/tex]
12 = k
Next, input the k-value above and solve for f(x):
[tex]\frac{f(x)}{x} = k[/tex]
[tex]\frac{f(x)}{6} = 12[/tex]
[tex](6)\frac{f(x)}{6} = 12(6)[/tex]
f(x) = 72
