Answer:
x = 11
Step-by-step explanation:
x + 8 = 19 subtract both sides by 8
x = 11
For the first digit there are 7 choices. For the second digit there are 6 choices (because we can't use the same one again). And so on, until there is only one choice for the last digit.
The number of possible codes is this:
7*6*5*4*3*2*1 = 7! = 5040
The answer is C (289pi/6 mi2)
You would each get 1/10 of a pound of trail mix
