Answer: the answer is 40 and 60 and the last one is 40 60
Step-by-step explanation:
Answer:
8x12=__?
hello :
a(x) = 3x - 12 and b(x) = x-9, so
a[b(x)]=a(x-9) =3(x-9)-12
a[b(x)]=3x-9-12
a[b(x)]=3x+21
8.64
