#### Answer

There are 29 mini-marshmallows in one serving of Swiss Miss Chocolate.

#### Work Step by Step

Evaluate using the PEMDAS rule for order of operations. The PEMDAS rule summarizes the order of operations:
First Priority; P - parentheses
Second Priority: E - exponents
Third Priorirty: M/D - multiplication or division, whichever comes first from the left
Fourth Priority: A/S - addition or subtraction, whichever comes first from the left
There are no parentheses and exponents so perform the multiplication or division first:
$=3+8 \div 2-21-4+47
\\=3+4-21-4+47$
Perform the addition or subtraction (from the left):
$=7-21-4+47
\\=-14-4+47
\\=-18+47
\\=29$
There are 29 mini-marshmallows in one serving of Swiss Miss Chocolate.