exam Maths Puzzle Numerical Ability

can you please help me i have no idea how to do ratio problems thank you you are great.
66. Stabilization ratio. The stabilization ratio (births / deaths) for south and central A

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exam Other Question

tan4theta=(4t-4t^3)1-6t^2+t^4 will someone please help me subtract and write in simplest form?

6/y-4
minus
1/y+1