exam Maths Puzzle Numerical Ability

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

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exam Other Question

Im really confused could someone please help?

Solve by factoring:

7a2+9a+2=0
Simplify each complex fraction:

A: [1+(3/4)]/[2-(1/8)]

B: [2+(x/y)]/(4/y)