tolong di jawab yaa....

Rumus Un = a+ (n-1)b

U2+U6=60
a+b + a+5b = 60
2a + 6b = 60...........(1)

U3= 23
a+2b = 23 (x 2)
2a + 4 b = 46..........(2)


2a + 6b = 60...........(1)
2a + 4 b = 46..........(2) (-)
0 + 2b = 14
b = 14/2 = 7

a+ 2(7) = 23
a= 23 - 14 = 9


U25= a+ 24b = 9 + 24(7)
U25= 9 + 168
U25= 177