exam Maths Puzzle Numerical Ability

hey how u doing I have a lot of problem with my homework I just don't have clue how to do it can u pliss help me

1.x-5=12
2.2n+3=-1
3.b over 4=2(b+1)
4.7-.5x=3 over (x to

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exam Other Question

We are given (sin m)(cos m) = , (sin n)(cos n) = . What is the ratio of (sin m + cos m) 2 to (sin n − cos n) 2? (Nine more than the product 4 and the number is 73). I am helping my niece and I am stumped, Help.....