exam Maths Puzzle Numerical Ability

Please help me with this problem I am about to pull my hair out.

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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exam Other Question

The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 3 seconds when the length is 36 inches, what is the period when L=5.0625 inches? Same thing with this one can someone find the exact value of tan 15 degree without using tables or a calculator. please show work.