tolong jawab kan no 7 dan 9..palai jalannya

7)
9^3/2 * 32^2/5
3^2*3/2 * 2^5*2/5
3^3 * 2^2
27 * 4
108 (D)

9)
3-----9-----18-----30   
    6-----9-----12    
        3-----3     

2a = 3
a = 3/2

3a + b = 6
b = 6 - 3a
b = 6 - 3*3/2
b = 6 - 9/2
b = 12/2 - 9/2
b = 3/2

a + b + c = 3
c = 3 - a - b
c = 3 - 3/2 - 3/2
c = 6/2 - 6/2
c = 0

Un = an^2 + bn + c
U10 = (3/2)*(10^2) + (3/2)*(10) + 0
U10 = (3/2)*(100) + 15
U10 = 150 + 15
U10 = 165 (A)