book Maths Puzzle Numerical Ability

I have a total of 35 coins consisting of dimes and nickels. THe value of these coins is $3.30. How many dimes and nickels do i have?

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Please help me (and explain the breakdown steps alon the way please)solve this (The chart may not come through, so I'll do my best to explain it. Thank you.

Tiger Woods rallied I am having trouble with these problems:
1. If (x,y) is in quadrant 2, where is the point ((-1)^36x, (-1)^49y)?

2. Simplify the expression -5x^0 +7

3. What is the factor of