Which of the following principles of experimental design reduces error due to change by repeating an experiment on different subjects under different conditions? A) Placebo effect B) Replication C) Control D) blindness E) Randomization

1 and 0

step-by-step explanation:

if your equation is in the form ax2 + bx + c, you can find the maximum by using the equation:

max = c - (b2 / 4a).

the first step is to determine whether your equation gives a maximum or minimum.

-x2 + 4x - 2.     thats an example hope it

the answer is 12,000.  

hope i !