UPSKILL MATH PLUS

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A function \(f: [-5, 9] \rightarrow \mathbb{R}\) is defined as follows:
 
f(x)=6x+15x213x4ififif5x<22x<66x9, Find:
 
(i) \(f(-3) + f(2)\) \(=\)
 
(ii) \(f(7) - f(1)\) \(=\)
 
(iii) \(2f(4) + f(8)\) \(=\)
 
(iv) 2f(2)f(6)f(4)+f(2) \(=\) ii