exam Maths Puzzle Numerical Ability

What is the result of (5^x)^y multiplied to [5^(3*y)]^z?

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exam Other Question

The equatiopn of a circle is x^2 + y^2 = 50. the region enclosed by the circle is also divided into two parts. find the area of the smaller one.

thnx! An investor has $20,000 o invest. If part is invested at 8% and the rest at 12%, how much should be invested at each rate to yield 11% on the total amount invested?