book Maths Puzzle Numerical Ability

what is the exact value of sin 22.5 degrees using the sum, difference, half, or double angle formulas and the exact value chart in the solution.

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book Other Question

Calculate the least velocity of projection required to give a missile a horizontal displacement of 500 m if the angle of projection is 24 degrees. solve -3/x+9/9x=-1 a)=-5/6 b)=-6/5 c)2 d) no answer

solve by addition
4x-y=3 5x+4y=2
a)(1,__) b), c)-10/21 d)23/21 (__,2)