We have 26 letters and 10 digits.
So, we have 26 choices for the first letter, 25 choices for the second letter (we can't pick the one we already chose), and 10 choices per digit (we can always choose any digit, because we can repeat them).
This leads to a total of

possible car targs.
Answer:
Slope = -5
Step-by-step explanation:
Let us write down the equation clearly and in a proper manner. This will help in solving the equation very easily.
8^(x + 3) = 16^(x - 1)
(2^3)^(x + 3) = (2^4)^(x - 1)
(2)^3(x + 3) = (2)^4(x - 1)
Then
3(x + 3) = 4(x - 1)
3x + 9 = 4x - 4
4x - 3x = 9 + 4
x = 13
I hope the procedure is clear enough for you to understand. I also hope that this is the answer that has actually come to your desired help.