If the no x-values repeat, yes it is a function so far I see it is a function.
Let 
denote the number of packages brought by customer 
. If, for instance, 
customers are in line, then the total number of packages is 
, and
since the number of packages brought by any customer is independent from the number of packages brought by any other.
a. 
is the probability that a total of 3 packages are waiting to get wrapped from among a total of 3 customers. This means each customer must have exactly one package. So
b. 
is the probability that a total of 11 packages are brought by 4 customers. The only way for there to be 11 packages is if 3 customers bring 3 packages and the last 1 brings 2. There are 
ways this can happen, so
Okay find the volume of the cube: 5*5*5=125 inches cubed
Now find the volume of the spheres: 4/3pir^3=24/3pi
125/(24pi/3) = 4.97 So you can make 4 balls
Yes, -6.7 is equal to -6 and 7/10. We know that in -6.7, 7 is in the tenths place. So you would have -6 7/10. You can also divide 7 by 10. 7 divided by 10 equals .7. So -6.7 is equal to -6 7/10. I hope that I could help! It is a lot easier than it first sounds!
