Write down the possible values of x
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Each tablet is 250 milligrams. Your doctor wants you to take 3 grams (g) per day
We know ,
1 gram = 1000 milligrams
250 milligrams makes 1 tablet
so 1000 milligrams makes how many tablets
= 4 tablets
1000 milligrams makes 4 tablets. That is 1 gram = 4 tablets
1 gram = 4 tablets
3 grams = 3 * 4 = 12 tablets
So you need to take 12 tablets per day.
No, 
is not a subspace of 
. A simple counter-example to the contrary: let 
with 
. However, scaling by -1 gives the vector 
and 
.