book Maths Puzzle Numerical Ability

problem 1; let T belongs to L(V) such that T not equal to I,T not equal to 0,T not equal to -I but T^2=T.please help me in finding the minimal polynomial of T.

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book Other Question

A fruit crate has square ends and is twice as long as it is wide. Find the volume if its width is 20 inches.

im lost on how to evalvaute.

/ 11 / + / -11 /

But these / are straight lines