To test the efficacy of vitamin c in preventing colds, army recruits are randomly assigned to one of two groups: one in which 500 mg of vitamin c is administered daily, and one in which 500 mg of a placebo is administered daily. both groups are followed to determine the number and severity of subsequent colds. what type of study design is this? cross-sectional study case-control study prospective cohort study historical prospective cohort study clinical trial community physical examination records of the incoming freshmen class of 1935 at the university of minnesota are examined in 1980 to see whether their recorded height and weight at the time of admission to the university are related to their chance of developing coronary heart disease by 1981. what type of study design is this? cross-sectional study case-control study prospective cohort study historical prospective cohort study clinical trial community trial

aloha~! my name is zalgo and i am here to you out on this amazing day. to answer your question, yes, nonzero numbers can have a greatest common factor and that would be 1. still don't get it? let me considering every number is divisible by 1 and hence every number has 1 as a factor of theirs. so, if 2 nonzero numbers didn't share any gcf (greatest common factor), they would still have a factor in common and that would be 1.

i hope that this ! : p

"stay and stay proud! " - zalgo

(by the way, do you mind marking me as brainliest? i'd greatly appreciate it! mahalo! x3)

too many. (jk)

31 v bucks

step-by-step explanation:

since you bought 25 on friday and 6 on tuesday, you can just add them up.

25+6=31

check your work.

31-6=25

i hope this !

-yand3r3

the second option

step-by-step explanation:

can someone me: the midsegment through the legs of an isosceles triangle is 4 in. find the sides of the triangle if its perimeter is 20 in. ,   and point g is the centroid of the right △abc with hypotenuse ab=18 in. find cg.