Assuming the keypad has all 26 letters and the numbers 1-9 there are 2106 possible codes
9x9x26=2106
Say you are trying to write a very big number, how about 13 s extillion
Now, we could write this number like this
13,000,000,000,000,000,000,000 in standard notation
Or, we could write it like this
1.3 x 10^22, in scientific notation, which is vastly easier to deal with.
The correct answer is 19 :)
Turn f(x) into y so the equation is y=x+2. Now switch their places so it is x=y+2. Now solve for y. The answer is y=x-2.
