Confounding . a. is used when subjects are assigned to different groups through a process of random selection.

b. is a technique in which a subject doesn't know whether he or she is receiving a treatment or a placebo.

c. is the repetition of an experiment on more than one subject.

d. occurs in an experiment when you are not able to distinguish among the effects of different factors.

This question is related to statistics and probability

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

you have to wait a while to reward brainliest if only one person answers. if 2 people answer there should be a "mark brainliest" on their question.

i cant fully remember all of the ranks, here are the ones i remember.

hand, ambitous, ace, genius.

step-by-step explanation:

for volume, add base x height x width