Question

Can someone help me with four and five? I think the answer for four would be three but I'm not sure

Answer 1

3. Eventually you will have negative numbers when working with a decreasing pattern. There may be no negative absences. The only way is if those are leading into the people who are present.
4. 15 segments. n=n x (n-1)/ 2
5. Use the formula. 10 x (10-1) / 2
                                   10   x  9 / 2
                                       90/ 2
                                        45   segments in a figure with 10 points.

Answer 2

Yes you are correct it is 3