tolong ya make cara yaa makasihhh

urutan: -3
u1= 20
u2= 17
u3= 14
u4= 11
u5= 8
u6= 5
u7= 2
u8= -1
u9= -4
u10= -7
u11= -10
u12= -13
u13= -16
u14= -19
u15= -22 (B)