exam Maths Puzzle Numerical Ability

where does sinx= -4/5 ?
in radian please

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Please help me to understand how to do this...it doesn`t make sense to me. Thank you so very much in advance for helping me. Here is the problem:

3^w * 3^5-w * 3

Thank The basal energy requirement B is the number of calories that a person needs to maintain the life process. For a 28-year-old femaile with a height of 160 centimeters and a weight