book Maths Puzzle Numerical Ability

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Suppose that a polynomial function of degree 4 with rational coefficients has -1, 0, and 2 - 3i as zeros. What is the remaining zero?

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A wire of length 17cm is bent to make an isoceles triangle with base length of 6cm. What is the area of this triangle? Please help me with the steps and the formula.
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The strength of a steel bar is proporitional to its cross-sectional area. A steel bar is 3/4 in. wide and 1/2 in. thick. How many times stronger tyhan this bar is a steel bar thet is 1.5 in. wide and 1.5 in. thick?