Book Maths Puzzle Area and Volume

Find the lateral area of the small cone that has a radius of 3 inches and a height of 4 inches.

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Book Other Question

The equation ax^2 + bx + c = 0 can be solved using fromula method and this is a quadratic in x. my question is how to make x as subject in the equation

y= (4/x^2) + (5x + 8/x^2) simplify the square root of 128