The simplification of given expression is: 
Step-by-step explanation:
Given fraction is:

When the exponents with same base are in numerator and denominator, the exponents can be added or subtracted
As we prefer to keep the exponents positive, both the exponents in the denominator will be moved to numerator

Hence,
The simplification of given expression is: 
Keywords: Exponents, Fractions
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Answer:
0.2666666666
Step-by-step explanation:
first 2÷9=0.2222222222
second-6/5=-1.2
third 0.2222222222×(-1.2)=0.2666666666
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Answer:
8.4cm
Step-by-step explanation:
In a circle, d = 2r, so d = 2 * 4.2cm = 8.4cm