they easiest way to find the right answer is to look at the 2 first terms and checking if they equal 64x³
doing so:
A:
48x³+...
B:
64x³+...
C:
9x³-48x³+...
= -39x³+...
-> the answer should be B, to make sure this is the right answer, you can just solve B
B:
(4x+3)(16x²-12x+9)
= 64x³- 48x²+36x+48x²-36x+27
= 64x³+27
-> answer B is correct
Check out https://www.umass.edu/preferen/Game%20Theory%20Evolving/GTE%20Public/GTE%20Answers.pdf it will help!
Answer:
x^2+10x+25
Step-by-step explanation:
x^2+10x+c
to find c
10/2=5
so 5^2= 25
so answer = x^2+10x+25
First of all, this is not an observational study, but an experiment, since we have two groups and one of the two groups is manipulated or treated. In an observational study the subjects are only observed.
Second, the students did not choose their groups - so we can't choose the last answer.
Therefore the correct answer is:
This is an experiment because a treatment was applied to a group.