Answer:
He should cross multiply 90 and 60, and then divide by 100. The answer is 54.
Answer:
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Step-by-step explanation:
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The first one includes both
Answer:

Step-by-step explanation:
Just Square the numbers like a normal equation.
4² = 16
9² = 81
This gives us 
or 0.198 as a decimal (approx)
Answer:
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Step-by-step explanation: