If f(a)=4a-6, what is the value of (f(5a)-f(a))/2 ? Choose the correct choice from the following choices:
A) 12a-6
B) 10a+5
C) 5a/6
D) 4a-6
E) 20a+6
f(a)=4a-6   f(5a) = 20a-6   (f(5a)-f(a))/2 = (20a-6+4a-6)/2 = 12a-6   12a-6nswer is
<result>A</result>
If f(a)=4a-6, what is the value of (f(5a)-f(a))/2 ?