Will give brainest for several weeks, the function  f(x) = 3(4)x  represented the number of birds infected with an illness  x  weeks after the first birds became sick. how did the number of sick birds change each week?

It's C i just did it.

F(x)=3(4)^x is an exponential function. Hence, this equation will increase by the exponent of x.
Let's make a table of values and look for the pattern:

xf(x)
0        3     (zero power rule: 4^0 = 1)
1        12
2         48
3        192

So, let's look at the output values. From 3 to 12 (times 4), from 12 to 48, (times 4), from 48 to 192 (times 4).
So, the best answer is C. The number quadrupled each week.

Agreed i also had the same answer