exam Maths Puzzle Numerical Ability

Please help me! Simplify and evaluate (x^7y^-4z^0/5^-2x^3y^-8z^-9)^2 This is a homework question. Your help is appreciated.

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exam Other Question

The measure of four interior angles of a regular pentagon are 95, 120, 80, and 135. Find the measure of the fifth interior angle. ANNA HAS 12 BILLS IN HER WALLET, SOME $5 AND SOME $10 THE TOTAL VALUE OF THE BILLS IS $100. HOW MANY OF EACH BILL DOES ANNA HAVE?