exam Maths Puzzle Numerical Ability

Bruce has $5.50 in dimes and quarters. He has eight more quarters than dimes. How many quarters does he have?

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Will somebody please help me with this problem!
If we establish an identity, -sinA cscA -sin^2 A -cos^2 A -tanA cotA would equal which of the following:
1. -2 + 2sin^2 A
2. -3 Find the x and y- intercepts, if they exist. -4x + 8y =12