exam Maths Puzzle Numerical Ability

find all exact solutions of the equation:
2sinx+1=0

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exam Other Question

Find all real zeros of the function:
* f(x)=-7x^4+343x^2 given length is 13 m,breadth 150 cm and height 10000 inch.find volume of rectangle

a.130000
b.4953
c.19500
d.39000