The teacher will be very surprised to see your correct solution 😉
-pi x1 = ---- 2
7*pi x2 = ---- 2
x2 = 7*pi/2
sum
pi 7*pi - -- + ---- 2 2
=
3*pi
product
-pi 7*pi ----*---- 2 2
=
2 -7*pi ------ 4
-7*pi^2/4
x1 = -76.9690200129499
x2 = -359.712358836031
x3 = 86.3937979737193
x4 = -39.2699081698724
x5 = -58.1194640914112
x6 = -83.2522053201295
x7 = 92.6769832808989
x8 = -20.4203522483337
x9 = -102.101761241668
x10 = 67.5442420521806
x11 = -26.7035375555132
x12 = -64.4026493985908
x13 = -1.5707963267949
x14 = 17.2787595947439
x15 = -95.8185759344887
x16 = 10.9955742875643
x17 = 36.1283155162826
x18 = 48.6946861306418
x19 = 111.526539202438
x20 = -7.85398163397448
x21 = 73.8274273593601
x22 = 29.845130209103
x23 = -45.553093477052
x24 = 54.9778714378214
x24 = 54.9778714378214