Answer:
19/3 or 6.33 continuing
Step-by-step explanation:
using pemdas, do the exponent first
6-2=4
then multiply by 4
4x4 is 16
add 3^2 to this, which = 9
so 16+9-6 is on top which equals 19, this is over 3
so 19/3
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13) (your answer is incorrect)

14) (your answer is incorrect)

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16)
-expression to represent this situation

Answer: In 1 group 57 students
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P.S. Hello from Russia :^)