She drinks 4.27 grams on calcium in 14 days at one glass of milk containing 14 mg per day
(-7/8)(-3/4)
multiply the numerators together
(-7)(-3)=21
multiply the denominators together
(-8)(-4)=32
answer:
21/32
<h2>
Answer:</h2>
The probability is:

<h2>
Step-by-step explanation:</h2>
It is given that:
An urn contains balls numbered 1 through 20.
A ball is chosen, returned to the urn, and a second ball is chosen.
This means that this is a case of a replacement.
Hence, one of the event is independent of the other.
Now we know that the probability to get a particular number of ball is:

( Since, there are total 20 balls and a ball of one particular number is just unique )
i.e. 
Hence, the probability that the first and second balls will be a 8 is:
