Evaluate the following expressions. (i) (10x−25)÷5 (ii) 10y(6y+21)÷5(2y+7) (iii) 96abc(3a−12)(5b−30)÷144(a−4)(b−6)

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What is the formula of \[{x^2} + {y^2} + {z^2}?\

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How many perfect cubes can you find from 1 to 100? How many from -100 to 100?