book Maths Puzzle Numerical Ability

simplify the expression
-4(5c+7)-3c+13

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book Other Question

the lenghts of the legs of a right triangle are 7 and 24. Find the lenght of the hypotenuse A box with a square base no top is to be made from a square piece of tin by cutting out a 3cm square from each corner and folding up the sides. If the box is to hold 48cm3, what size piece of tin should be used.