exam Maths Puzzle Numerical Ability

please help me with the following question with a good explanation on how to work it out for me and my son, Thanks in advance! evaluate the expression: (1000!-999!)/998!

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Can someone help solve this?
Let H(t)=4+4sin(pi t/2). Approximate to the nearest hundredth
all values t in the interval [0,4 pi] for which Ht=6.
6+29.27-(-16)