Answer:
4
Step-by-step explanation:
there are four digits. you can put them in 4 different orders
x=11
You first subtract 7 from both sides in which you get 15.
you then divide by 3 on both sides and you get 5.
you can then add 6 on to 5 and get
hope this helps ^.^
Tn = dn + T0
(dn is difference between the numbers and T0 is the term before the first one given to you)
Tn= 3n + 3