book Maths Puzzle Numerical Ability

seven times a number is the same as 12 more than 3 times the number. Find the number. we have to write an equation plus solve it.

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book Other Question

Find the domain of f, the roots of f (x) = 0, and determine the signs of f where f (x) = x^2 -1/ square root of x + 1 + square root or x + 1 - Thank you for any help you can give A triangle can be formed having side lengths 4,5,& 8. It is impossible, however, to construct a triangle with sidelengths 4,5 & 10. Using the side lengths 2,3,5,7 & 11, howmany different triangles with exactly 2 equal sides can be formed?