If f(x) is the total number of bacteria present in a sample after x hours, which of the following statements best describes the meaning of f(2) = 12?

the total number of bacteria present in the sample after 12 hours is 2.

the total number of bacteria present in the sample after 6 hours is 2.

the total number of bacteria present in the sample after 2 hours is 12.

the total number of bacteria present in the sample after 6 hours is 12.

Brady has a 20 year fixed rate mortgage for $215,500 with monthly payments of 1,305.89.the annual interest rate is 4%. what is the total cost of the principal and interest for this loan rounded to the nearest dollar

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.