beserta caranya yah, mohon bantuan nya

1. U1=70
U3=52
b-2= 22
b=-11

U15= a+(n-1)b
= 70+(15-1)(-11)
=70+14*(-11)
=70+(-154)
=-84

3. U1=2
U4=54
r3=27
r=3

u7 = 1.458

5. A(3,2) T (3,-4) = A'(6,-2)

6. A (5,7) = A' (x.k , y.k)
= (5.5 , 7.5)
=(25,35)