tolong kerjakan di atas dengan benar.

a. Un = a + ( n-1 ) b
U11 = 7 + ( 11-1 ) 3
= 7 + 10.3
= 7 + 30
U11 = 37

b. Un = a + ( n-1 ) b
U20 = 2 + ( 20-1 ) 50
= 2 + 19.50
= 2 + 950
U20 = 952

c. Un = a + ( n-1 ) b
U15 = -7 + ( 15-1 ) 5
= -7 + 14.5
= -7 + 70
U15 = 63

d. Un = a + ( n-1 ) b
U10 = 4 + ( 10-1 ) 8
= 4 + 9.8
= 4 + 72
U10 = 76

e. Un = a + ( n-1 ) b
U13 = 2 + ( 13-1 ) 1,5
= 2 + 12.1,5
= 2 + 18
U13 = 20

Semoga Membatu