You can’t simplify it any further. 288 1/4 is already simplified.
One quarter (25%) of the data is in any quartile. That is the meaning of the term "quartile."
25% of data is in quartile 1
It equals 40/6. I hope this helps. Good luck!
The angle vertical to it is DF
70º
It's a supplementary angle so 180º - 110º