exam Maths Puzzle Numerical Ability

Please help supposed to simplify!

a to the neg2 exponent subtracted by b to the neg2 exponent divided by ab to the neg 4 exponent subtracted by ba to the neg 4 exponent all th

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exam Other Question

This is problem on retirement pay
The annual social security benefit of a retiree depends on the age at the time
of retirement. The acccompanying graph gives the annual benefit I have 140 nickels, dimes, and quarters, but I have 15 more quarters that dimes. If the total value of my coins is $20, how many of each coin do I have?