exam Maths Puzzle Numerical Ability

Fund the domain of the function:

f(x)=square root of 81-x squared

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exam Other Question

Add. 4/5 + 1/10 A personn invested 10,000. The greater part is invested at 6% and the remainder at 5%. The annual income from the greater part is $160 more than the annual income form the smaller part. what is the smaller part of the the investment?