exam Maths Puzzle Numerical Ability

Hello out there,I'm having problems with some linear equation that is giving me a hard time,can someone please help me,the first problem is,determine if the equation is linear,and

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exam Other Question
5b+2(b+1)=16 can you help solve the equation. What is the formula? can you help me solve this: [(-1/2)(c^2)(b^3)(a)](2a^2)(b^2)(c^4)

Thanks