B to the zero power over B to the second power

b^-2  or 1/b^2

Step-by-step explanation:

b^0

b^2

We know when we divide powers of the same base, we subtract

b^(0-2)

b^-2

If we are not allowed negative exponents then

1/b^2

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls